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Connect M22 x 1.5 pressure-washer, 14 mm bore to M22 x 1.5 pressure-washer, 15 mm bore

How to join M22 x 1.5 (14 mm) and M22 x 1.5 (15 mm), 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
M22 x 1.5 pressure-washer, 15 mm bore (M22 x 1.5 (15 mm))
Seals on O-ring on the 15 mm spigot
Adapter neededM22 14 mm to 15 mm pressure-washer adapter

Not a direct fit. Joining M22 x 1.5 pressure-washer, 14 mm bore to M22 x 1.5 pressure-washer, 15 mm bore needs a M22 14 mm to 15 mm pressure-washer adapter.

The adapter to buy

Search Amazon for M22 14 mm to 15 mm pressure-washer adapteraffiliate searchFind M22 14 mm to 15 mm pressure-washer adapter on eBayaffiliate

Both fittings share the same M22 x 1.5 external thread, so they screw together, but the internal spigot bore differs: 14 mm on Karcher, 15 mm on most others. The join can leak or the lance can foul. A 14-to-15 mm adapter, or fitting the correct O-ring, makes accessories interchangeable.

This is the most common pressure-washer leak. If a new lance leaks at the handle despite tightening, you almost certainly have a 14 versus 15 mm mismatch, not a faulty part.

Related connections

M22 x 1.5 pressure-washer, 14 mm boreM22 x 1.5 (14 mm)M22 x 1.5 pressure-washer, 15 mm boreM22 x 1.5 (15 mm)M22 x 1.5 pressure-washer, 15 mm bore to Garden Hose Thread (GHT / NH)adapterM22 x 1.5 pressure-washer, 14 mm bore to Garden Hose Thread (GHT / NH)adapterM22 x 1.5 pressure-washer, 15 mm bore to 3/4" BSP parallel (G3/4 / BSPP)adapterM22 x 1.5 pressure-washer, 15 mm bore to 3/8" NPT (National Pipe Taper)adapter

Sources: Pressure-washer M22 14mm vs 15mm fitting data (M MINGLE spec)