Set Square wrote:
Tony Bryer wrote:
David Lang wrote:
Dead right. All threaded taps are BSP threads, even in Europe. In
30 years of connecting pressure washers to taps I've never found a
domestic tap that wasn't 3/4" BSP.

There are 5/8" taps around - I used to have one!

Ditto. But a 3/4 connector wouldn't begin to stay put on a 5/8 tap - so that
is unlikely to be the OP's problem.

When I had this problem, it was the (new!) washer, not being thick
enough to squash between the plastic fitting and the brass tap. The
water pressure is high enough here to easily squirt a jet over the
house, which is a fairly tall one, for a two storey. Until I got
the thing sorted out, water simply *hissed* out all over the place.