Connection standard
Garden-hose thread (GHT) at the pressure washer water inlet
The 3/4 in garden-hose thread at a pressure washer's water inlet: its size and pitch, the inlet-only quick connect kits, and the supply limits makers set.
Also listed as GHT, garden hose thread, 3/4 GHT
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Short answer
Garden-hose thread is the low-pressure water inlet side of a pressure washer, not the high-pressure outlet. Dixon lists 3/4 in GHT as 1.0625 in male outside diameter with 11-1/2 threads per inch. Kärcher's 2.645-221.0 garden hose quick connect kit fits the inlet and cannot be used on the high-pressure outlet. Makers also set supply limits: Generac requires water below 100°F, and Sun Joe and Champion limit inlet water to 104°F on their models.
What fits
- Garden-hose quick-connect kitWestinghouse WPWFIT3KIT 6‑piece quick-connect kit for garden hose and M22‑14 mm hose/gun, brassCheck price on Amazon
Key facts
- How to recognize it
- On a disconnected part with the water off: measure the male thread's outside diameter with a caliper or O.D. tape; Dixon lists 3/4 in GHT at 1.0625 in[1]
- Thread
- 3/4 in GHT: 1.0625 in male outside diameter, 11-1/2 TPI (Dixon). ASME B1.20.7 covers hose coupling threads in nominal sizes from 1/2 to 4 in[1][2]The ASME page does not use the terms 'garden hose thread' or 'GHT'.
- How it seals
- Not confirmedNo source read describes how GHT inlet fittings seal.
- Male and female ends
- Not confirmedThe inlet kits read do not state genders.
- Where makers use it
- The water inlet only. Kärcher's 2.645-221.0 kit is a garden hose quick connect adapter set for the inlet and cannot be used on the high-pressure outlet[3]
- Adapters makers sell
- Kärcher 2.645-221.0: a garden-hose connector, an inlet connector for Kärcher electric washers, and a connector that converts the threaded inlet on Kärcher gas washers to quick connect. RYOBI RY31QCK01: a quick-connect kit that links the garden hose to the pump inlet, listed to 4,000 PSI[3][4]Kärcher does not say which piece fits which model.
- Ratings on parts
- Supply limits rather than part ratings: Generac's manual requires water below 100°F, a supply hose no longer than 50 ft and at least 3.8 GPM at no less than 30 PSI; Champion's 100384 manual recommends a 5/8 in or larger garden hose; Sun Joe's SPX3000 and Champion's 100386 limit water to 104°F[5][6][7][8]
- Common mix-ups
- A garden-hose fitting belongs on the low-pressure supply, not the high-pressure outlet (Kärcher). MTM's 145 PSI garden hose foamer is a different product from a high-pressure foam cannon[3][9]
- Not confirmed
- Not confirmedSeal type and genders of GHT inlet parts; which Kärcher kit piece fits which model; the ASME standard itself was not read.
Watch out for
- Never send hot water to an inlet limited to 104°F (Sun Joe SPX3000, Champion 100386) or 100°F (Generac's manual).
- Champion's 100384 manual lists a garden hose that is too small, a restricted supply and a clogged inlet filter among the causes of low or fluctuating pressure.
- Kärcher's page lists many models for the 2.645-221.0 kit but not which piece fits which model; check the manual or Kärcher support.
What fits
Product details below are the seller's own description unless a source is shown. Pick the variant named for each item.
Garden-hose quick-connect kit
Westinghouse WPWFIT3KIT 6‑piece quick-connect kit for garden hose and M22‑14 mm hose/gun, brassChoose the 6-piece WPWFIT3KIT.
Westinghouse lists a garden-hose quick connect with two matching fittings in this kit, for its ePX and WPX machines. It states no pressure rating.
Questions
What thread is on a garden hose?
Dixon lists 3/4 in garden hose thread (GHT) as 1.0625 in male outside diameter with 11-1/2 threads per inch.[1]
Can I use a garden hose quick connect on the high-pressure outlet?
No. Kärcher says its 2.645-221.0 garden hose quick connect kit is for the water inlet and cannot be used on the high-pressure outlet. See the water inlet.[3]