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Connect M22 x 1.5 pressure-washer, 14 mm bore to Garden Hose Thread (GHT / NH)

How to join M22 x 1.5 (14 mm) and 3/4"-11.5NH, and what stops it leaking.

Needs adapter
End A
M22 x 1.5 pressure-washer, 14 mm bore (M22 x 1.5 (14 mm))
Seals on O-ring on the 14 mm spigot
via adapter
End B
Garden Hose Thread (GHT / NH) (3/4"-11.5NH)
Seals on flat washer or O-ring in the female coupling
Adapter neededM22 (14 mm) to garden hose (GHT) adapter

Not a direct fit. Joining M22 x 1.5 pressure-washer, 14 mm bore to Garden Hose Thread (GHT / NH) needs a M22 (14 mm) to garden hose (GHT) adapter.

The adapter to buy

Search Amazon for M22 (14 mm) to garden hose (GHT) adapteraffiliate searchFind M22 (14 mm) to garden hose (GHT) adapter on eBayaffiliate

A 14 mm bore M22 machine (typically Karcher and gas units) reaches a garden hose fitting with an M22-to-GHT adapter sized for the 14 mm spigot O-ring. Fitting a 15 mm adapter here leaves a gap the O-ring cannot bridge.

Buy the 14 mm version specifically. The thread is the same as a 15 mm adapter, so it will screw on and then weep from the mismatched bore.

Related connections

M22 x 1.5 pressure-washer, 14 mm boreM22 x 1.5 (14 mm)Garden Hose Thread (GHT / NH)3/4"-11.5NHGarden Hose Thread (GHT / NH) to 3/4" BSP parallel (G3/4 / BSPP)adapterGarden Hose Thread (GHT / NH) to 1/2" BSP parallel (G1/2 / BSPP)adapterMale aerator thread (M22 x 1 / 15/16"-27) to Garden Hose Thread (GHT / NH)adapterM22 x 1.5 pressure-washer, 14 mm bore to M22 x 1.5 pressure-washer, 15 mm boreadapter

Sources: Pressure-washer M22 14mm vs 15mm fitting data (M MINGLE spec) · ASME B1.20.7 (garden hose / GHT / NH threads) · NPSH / NH / NHR hose coupling thread table, Fittings.space