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Pressure Washer Fittings & Couplers

Pressure washer fittings and couplers cause most leaks, not the hose: a flattened o-ring or a thread standard that does not match. Quick connects, M22 couplers, NPT and BSP adapters, ball valves and swivels.

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Mi-T-M 32-0915 Hose Fitting – Adapter-Rv Generator 125v
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$163.99
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$163.99

Mi-T-M 32-0915 Hose Fitting – Adapter-Rv Generator 125v

Mi-T-M
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RV generator adapter that lets you plug an RV cordset into a 30A generator outlet. It is rated 30A/125V with a female end and a male end.Specificat...

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$163.99
Mi-T-M 23-0414 Hose Fitting – Air/Water Adapter
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$52.99
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$52.99

Mi-T-M 23-0414 Hose Fitting – Air/Water Adapter

Mi-T-M
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Delivers in 4–10 business days

Air/liquid adapter kit for filling tires with liquid. It connects a standard tractor valve to a 3/4-inch garden hose bibb, and a push-button bleede...

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Mi-T-M 17-4952 Hose Fitting – Coupler Test Bar - Air
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$44.99
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$44.99

Mi-T-M 17-4952 Hose Fitting – Coupler Test Bar - Air

Mi-T-M
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Coupler test bar with four 1/4-inch plugs in Tru-flate Automotive, Industrial Interchange, ARO and Lincoln styles. Use it to find out which plug st...

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$44.99
Mi-T-M AW-0017-0046K Hose Fitting – Air Qc Set-As-1/4f Soc 1/4 Mp
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$32.00
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$32.00

Mi-T-M AW-0017-0046K Hose Fitting – Air Qc Set-As-1/4f Soc 1/4 Mp

Mi-T-M
In stock
Delivers in 4–10 business days

Automotive style coupler and plug set in 1/4-inch. The coupler has a female pipe thread and the plug has a male pipe thread, so you get both halves...

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$32.00
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$32.00
Mi-T-M AW-0017-0045K Hose Fitting – Air Qc Set-Iis-1/4f Soc 1/4mp
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$45.00
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$45.00

Mi-T-M AW-0017-0045K Hose Fitting – Air Qc Set-Iis-1/4f Soc 1/4mp

Mi-T-M
In stock
Delivers in 4–10 business days

Matched Industrial Interchange style set: one 1/4-inch coupler with a female thread and one 1/4-inch plug with a male thread. Together they give yo...

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$45.00
Mi-T-M 17-0048 Hose Fitting – Air Qc Socket-1/4 Aro-1/4 Fpt
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$12.00
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$12.00

Mi-T-M 17-0048 Hose Fitting – Air Qc Socket-1/4 Aro-1/4 Fpt

Mi-T-M
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Delivers in 4–10 business days

ARO style 1/4-inch quick coupler with a 1/4-inch FPT end, made for air setups that use ARO style plugs. It makes swapping tools on the line quick.S...

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$12.00
Mi-T-M 17-0056 Hose Fitting – Air Qc Plug-1/4 Aro-1/4 Fpt
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$6.00
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$6.00

Mi-T-M 17-0056 Hose Fitting – Air Qc Plug-1/4 Aro-1/4 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

1/4-inch ARO style air plug with a 1/4-inch female pipe thread. Pair it with an ARO style coupler to connect and disconnect air equipment quickly.S...

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$6.00
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$6.00
Mi-T-M 17-0052 Hose Fitting – Air Qc Plug-1/4 Aro-1/4 Mpt
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$8.00
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$8.00

Mi-T-M 17-0052 Hose Fitting – Air Qc Plug-1/4 Aro-1/4 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

ARO style quick-connect plug, 1/4-inch, with a 1/4-inch male pipe thread. It goes on the tool or hose end that plugs into an ARO style coupler.Spec...

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$8.00
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$8.00
Mi-T-M 17-0047 Hose Fitting – Air Qc Socket-1/4 Ls-1/4 Fpt
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$36.99
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$36.99

Mi-T-M 17-0047 Hose Fitting – Air Qc Socket-1/4 Ls-1/4 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

Lincoln style air coupler, 1/4-inch, with a female 1/4-inch pipe thread. Use it where your shop runs Lincoln style plugs on its air tools.Specifica...

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$36.99
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$36.99
Mi-T-M 17-0055 Hose Fitting – Air Qc Plug-1/4 Ls-1/4 Fpt
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$7.99
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$7.99

Mi-T-M 17-0055 Hose Fitting – Air Qc Plug-1/4 Ls-1/4 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

Lincoln style 1/4-inch plug, female threaded 1/4-inch FPT, for attaching air hoses and tools to Lincoln style couplers.Specifications1/4-inch FPT -...

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$7.99
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$7.99
Mi-T-M 17-0051 Hose Fitting – Air Qc Plug-1/4 Ls-1/4 Mpt
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$8.99
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$8.99

Mi-T-M 17-0051 Hose Fitting – Air Qc Plug-1/4 Ls-1/4 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

1/4-inch Lincoln style plug with 1/4-inch MPT threads for connecting air tools and hoses to a Lincoln style coupler.Specifications1/4-inch MPT - 1/...

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$8.99
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$8.99
Mi-T-M 17-0046 Hose Fitting – Air Qc Socket-1/4 As-1/4 Fpt
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$21.99
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$21.99

Mi-T-M 17-0046 Hose Fitting – Air Qc Socket-1/4 As-1/4 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

Automotive style coupler sized for 1/4-inch air hose, with a 1/4-inch FPT connection. Mount it on a male thread to quickly hook up and release hose...

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Mi-T-M 17-0054 Hose Fitting – Air Qc Plug-1/4 As-1/4 Fpt
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$4.99
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$4.99

Mi-T-M 17-0054 Hose Fitting – Air Qc Plug-1/4 As-1/4 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

Automotive style air plug with a 1/4-inch FPT thread. It fits on a male-threaded hose or tool fitting and makes the quick-connect side of the joint...

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$4.99
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$4.99
Mi-T-M 17-0044 Hose Fitting – Air Qc Socket-1/4 As-1/4 Mpt
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$12.00
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$12.00

Mi-T-M 17-0044 Hose Fitting – Air Qc Socket-1/4 As-1/4 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

1/4-inch Automotive style air coupler with a 1/4-inch MPT thread. It lets you connect and disconnect air tools and hoses quickly.Specifications1/4-...

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$12.00
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$12.00
Mi-T-M 17-0050 Hose Fitting – Air Qc Plug-1/4 As-1/4 Mpt
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$6.00
from $6.00
$6.00

Mi-T-M 17-0050 Hose Fitting – Air Qc Plug-1/4 As-1/4 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

Automotive style air plug in 1/4-inch with a male 1/4-inch pipe thread. Install it in an air tool inlet so the tool snaps into an Automotive style ...

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$6.00
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$6.00
Mi-T-M 17-0068 Hose Fitting – Air Qc Socket-1/4 Iis-3/8 Mpt
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$22.00
from $22.00
$22.00

Mi-T-M 17-0068 Hose Fitting – Air Qc Socket-1/4 Iis-3/8 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

Air coupler with a 3/8-inch male pipe thread and a 1/4-inch Industrial Interchange style socket. Use it to run 1/4-inch quick-connect tools from a ...

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$22.00
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$22.00
Mi-T-M 17-0067 Hose Fitting – Air Qc Socket-1/4 Iis-3/8 Fpt
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$24.99
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$24.99

Mi-T-M 17-0067 Hose Fitting – Air Qc Socket-1/4 Iis-3/8 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

1/4-inch Industrial Interchange style coupler on a 3/8-inch FPT body. It lets a 3/8-inch threaded line accept 1/4-inch Industrial Interchange plugs...

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$24.99
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$24.99
Mi-T-M 17-0060 Hose Fitting – Air Qc Socket-3/8 Iis-3/8 Fpt
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$45.00
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$45.00

Mi-T-M 17-0060 Hose Fitting – Air Qc Socket-3/8 Iis-3/8 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

Quick-connect air socket in the 3/8-inch Industrial Interchange style, with a 3/8-inch female pipe thread for mounting on a male fitting.Specificat...

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$45.00
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$45.00
Mi-T-M 17-0062 Hose Fitting – Air Qc Plug-3/8 Iis-3/8 Fpt
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$11.00
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$11.00

Mi-T-M 17-0062 Hose Fitting – Air Qc Plug-3/8 Iis-3/8 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

Female-threaded 3/8-inch FPT plug in the 3/8-inch Industrial Interchange style for quick air hose and tool connections.Specifications3/8-inch FPT -...

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$11.00
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$11.00
Mi-T-M 17-0059 Hose Fitting – Air Qc Socket-3/8 Iis-3/8 Mpt
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$41.99
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$41.99

Mi-T-M 17-0059 Hose Fitting – Air Qc Socket-3/8 Iis-3/8 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

3/8-inch Industrial Interchange style coupler with a 3/8-inch MPT thread, for air lines running the larger 3/8-inch quick-connect size.Specificatio...

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$41.99
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$41.99
Mi-T-M 17-0061 Hose Fitting – Air Qc Plug-3/8 Iis-3/8 Mpt
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$8.99
from $8.99
$8.99

Mi-T-M 17-0061 Hose Fitting – Air Qc Plug-3/8 Iis-3/8 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

3/8-inch Industrial Interchange style air plug with a male 3/8-inch pipe thread. It connects air tools and hoses to a matching 3/8-inch coupler.Spe...

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$8.99
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$8.99
Mi-T-M 17-0045 Hose Fitting – Air Qc Socket-1/4 Iis-1/4 Fpt
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$31.99
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$31.99

Mi-T-M 17-0045 Hose Fitting – Air Qc Socket-1/4 Iis-1/4 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

Air quick-connect socket in the 1/4-inch Industrial Interchange style, threaded 1/4-inch female pipe. Screw it onto a male fitting to make a fast c...

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$31.99
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$31.99
Mi-T-M 17-0053 Hose Fitting – Air Qc Plug-1/4 Iis-1/4 Fpt
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$5.99
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$5.99

Mi-T-M 17-0053 Hose Fitting – Air Qc Plug-1/4 Iis-1/4 Fpt

Mi-T-M
In stock
Delivers in 4–10 business days

1/4-inch Industrial Interchange style plug with a female 1/4-inch pipe thread. Thread it onto a male fitting to connect to an Industrial Interchang...

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$5.99
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$5.99
Mi-T-M 17-0043 Hose Fitting – Air Qc Socket-1/4 Iis-1/4 Mpt
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$15.00
from $15.00
$15.00

Mi-T-M 17-0043 Hose Fitting – Air Qc Socket-1/4 Iis-1/4 Mpt

Mi-T-M
In stock
Delivers in 4–10 business days

Industrial Interchange style quick-connect coupler for 1/4-inch air lines, with a 1/4-inch male pipe thread on the back. Thread it into a hose end ...

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$15.00
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$15.00
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Pressure Washer Fittings and Couplers That Match Your Thread Standard

Most pressure washer leaks are not hose failures or pump failures. They are fittings: a coupler with a flattened o-ring, an adapter cross-threaded once and never sealed again, or a quick connect from a different standard forced into place. This range covers quick connect plugs and sockets, M22 screw couplers, NPT and BSP adapters, ball valves, swivels and winterizing fittings.

Know Which Standard the Machine Uses Before Ordering

Commercial machines mix several connection standards, and they are close enough in size to look interchangeable while not sealing. M22 screw couplers are common on European-designed pumps. Quick connect plugs and sockets in 3/8" are the working standard on most commercial setups in the field. NPT threads are tapered and seal on the thread itself; BSP parallel threads seal on a face or washer, and the two do not mate reliably even when they start. Measure and identify before ordering rather than after a fitting will not seat.

Brass, Stainless and Where the Distinction Matters

Brass fittings are common, inexpensive and entirely adequate on cold water machines. On hot water units, some brass couplers are rated cold-water-only and will fail with heat. Stainless costs more and earns it on hot water, on units running detergents and on anything used near salt. When replacing a fitting on a hot water machine, check the rating on the part rather than assuming it matches what came out.

Swivels and Ball Valves Solve Specific Problems

A swivel between gun and hose stops the hose twisting as an operator turns, which reduces kinking and the fatigue that comes from fighting a coiled line all day. Inline ball valves let flow be shut off at the gun end without stopping the machine, useful when changing a surface cleaner or nozzle mid-job. Winterizing fittings let antifreeze be drawn through the pump before storage, which is the difference between a machine that starts in spring and one with a cracked head.

Keep spare o-rings for every quick connect size in use. They are the cheapest part on the machine and the most common single cause of a drip that gets ignored until it becomes a spray. A coupler that has been cross-threaded once will usually never seal again no matter how hard it is tightened, and forcing it only damages the mating part as well. Replace both halves of a pair when one has been distorted, and check that plug and socket share a standard before assuming either is faulty.

Related: Pressure Washer Hoses, Pressure Washer Guns & Wands, Pressure Washer Parts & Accessories, Pressure Washer Nozzles.

Frequently Asked Questions

What size are pressure washer quick connect fittings?
3/8" quick connect plugs and sockets are the working standard on most commercial machines. M22 screw couplers appear on many European-designed pumps. Identify which the machine uses before ordering, as they are similar enough in size to look interchangeable.
Can I mix NPT and BSP pressure washer fittings?
No. NPT threads are tapered and seal on the thread; BSP parallel threads seal on a face or washer. They can start together but will not seal reliably.
Do I need brass or stainless steel fittings?
Brass is fine on cold water machines. Some brass couplers are rated cold-water-only and fail on hot water units, so check the part rating for hot water, detergent use, or anywhere near salt, where stainless is the safer choice.
Why does my pressure washer leak at the coupler?
Most often a flattened or nicked o-ring rather than a faulty coupler. Replace o-rings at the first drip. A mismatched thread standard is the other common cause.
What is a winterizing fitting for?
It lets antifreeze be drawn through the pump before storage. Water left in a pump over a hard freeze can crack the head, which costs far more than the fitting.

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