Couplers Parts
72 products available
A coupler joins two threaded lines or bridges two different fittings — hex couplers step between pipe sizes, flex couplers connect a motor or engine shaft to a pump shaft, and quick-connect sockets couple a hose end to a gun or lance without tools. Material and pressure rating are what separate a coupler that lasts from one that fails: brass suits general-purpose plumbing at moderate pressure, while rated steel couplers carry the 3000–5000 PSI loads common on commercial pump discharge lines.
(100)FOSTER QC SOCKET 1/4" FPT BRASS
SKU: 7099
Buy the (100)FOSTER QC SOCKET 1/4" FPT BRASS — a brass quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
(100)FOSTER QC SOCKET 3/8" MPT BRASS
SKU: 7105
Buy the (100)FOSTER QC SOCKET 3/8" MPT BRASS — a brass quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
(200)QC SOCKET 1/4" FNPT BRASS
SKU: 3719
Brass quick-connect coupler (1/4 thread) for pressure washer wands and hose ends. SKU 3719, in stock at CheapPartz.
(200)QC SOCKET 1/4" FNPT STAINLESS STEEL
SKU: 2024
Stainless steel quick-connect coupler (1/4 thread) for pressure washer wands and hose ends. SKU 2024, in stock at CheapPartz.
(200)QC SOCKET 1/4" MNPT STAINLESS STEEL
SKU: 4629
Buy the (200)QC SOCKET 1/4" MNPT STAINLESS STEEL — a stainless steel quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from…
(200)QC SOCKET 3/8" FNPT BRASS
SKU: 2401
Brass quick-connect coupler (3/8 thread) for pressure washer wands and hose ends. SKU 2401, in stock at CheapPartz.
(200)QC SOCKET 3/8" FNPT STAINLESS STEEL
SKU: 4630
Buy the (200)QC SOCKET 3/8" FNPT STAINLESS STEEL — a stainless steel quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from…
(200)QC SOCKET 3/8" MNPT BRASS
SKU: 3004
Buy the (200)QC SOCKET 3/8" MNPT BRASS — a brass quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
(200)QC SOCKET 3/8" MNPT STAINLESS STEEL
SKU: 2025
Stainless steel quick-connect coupler (3/8 thread) for pressure washer wands and hose ends. SKU 2025, in stock at CheapPartz.
(300)STEEL HEX COUPLER 3/8 FPT, 4000 PSI
SKU: 2582
Buy the (300)STEEL HEX COUPLER 3/8 FPT, 4000 PSI — a steel quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
(400)QC SOCKET 1/4" MNPT BRASS
SKU: 5655
(400)QC SOCKET 1/4" MNPT BRASS: brass quick-connect coupler (1/4 thread), in stock now at CheapPartz with fast USA shipping.
0-RING BUNA N FOR 1/8" QC SOCKETS
SKU: 5732
0-RING BUNA N FOR 1/8" QC SOCKETS: Buna-N quick-connect coupler (1/8 thread), in stock now at CheapPartz with fast USA shipping.
1/4" GALVANIZED COUPLER
SKU: 2296
Buy the 1/4" GALVANIZED COUPLER — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
304SS COUPLER 1" FPT 150#
SKU: 5764
Buy the 304SS COUPLER 1" FPT 150# — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
304SS COUPLER 1/2 FPT 150#
SKU: 5216
Buy the 304SS COUPLER 1/2 FPT 150# — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
304SS COUPLER 1/4 FPT 150#
SKU: 5214
304SS COUPLER 1/4 FPT 150#: quick-connect coupler (1/4 thread), in stock now at CheapPartz with fast USA shipping.
304SS COUPLER 3/4 FPT 150#
SKU: 5763
Buy the 304SS COUPLER 3/4 FPT 150# — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
304SS COUPLER 3/8 FPT 150#
SKU: 5215
304SS COUPLER 3/8 FPT 150#: quick-connect coupler (3/8 thread), in stock now at CheapPartz with fast USA shipping.
BANJO 1-1/2" COUPLER x 1-1/2" FPT THREAD
SKU: 7255
Buy the BANJO 1-1/2" COUPLER x 1-1/2" FPT THREAD — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
BANJO 1-1/2" FPT COUPLER x MPT THREAD
SKU: 7253
BANJO 1-1/2" FPT COUPLER x MPT THREAD: quick-connect coupler (1/2 thread), in stock now at CheapPartz with fast USA shipping.
BANJO 1" COUPLER x BARB
SKU: 7248
BANJO 1" COUPLER x BARB: quick-connect coupler (1" size), in stock now at CheapPartz with fast USA shipping.
BANJO 1" FPT COUPLER x FPT THREAD
SKU: 7249
Buy the BANJO 1" FPT COUPLER x FPT THREAD — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
BANJO 1" FPT COUPLER x MPT THREAD
SKU: 7247
Buy the BANJO 1" FPT COUPLER x MPT THREAD — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
BANJO 1" MPT ADAPTOR x FPT THREAD
SKU: 7246
Buy the BANJO 1" MPT ADAPTOR x FPT THREAD — a quick-connect coupler for pressure washer wands and hose ends. Fast USA shipping from CheapPartz.
Couplers Buying Guide
Brass vs. steel, and why the rating matters
Brass hex couplers handle general low-to-moderate pressure plumbing and resist corrosion well in ordinary wash water. Steel hex couplers are used where the line sees higher discharge pressure — this catalog carries steel couplers explicitly rated to 3000 and 4000 PSI — and the stamped rating on the listing should meet or exceed your pump's max PSI, not just its average operating pressure.
Reducing couplers change size, not thread type
A coupler like "1/4 FPT x 1/8 FPT" steps a line down from one NPT pipe size to another; both ends are still standard tapered NPT threads, so it seals with the same PTFE tape or thread sealant as any other pipe fitting. Confirm both port sizes match your fitting and your hose or lance on either end.
Flex couplers are pump-to-motor specific
A flex coupler like the ZG145TC bridges a specific motor shaft size to a specific pump shaft size — for example 7/8" motor shaft to a 24mm pump shaft — and both dimensions must match your actual drive and pump. Getting either shaft size wrong means the coupler won't seat, so measure both shafts before ordering rather than matching by pump model alone.
Couplers FAQ
What PSI rating do I need on a coupler for my pump's discharge line?
The coupler's rated pressure should meet or exceed your pump's maximum PSI, not just its typical operating pressure — a brief pressure spike (e.g., a closed nozzle or unloader cycling) can exceed normal running pressure. Check the stamped rating on the specific coupler listing.
Do reducing couplers use different thread types on each end?
No — a reducing coupler like 1/4" FPT x 1/8" FPT keeps standard NPT threads on both ends, just at two different pipe sizes. It seals with the same thread sealant as a same-size NPT fitting.