I have a 13 year old Deltajet/Lavorwash pressure washer (came from Woolworths;-)
Do all pressure washers have the same outlet coupling? This outlet is a 1/2" BSP male thread, although the hose coupling seals against the internal bore of the mail coupling (which is not how standard plumbing fittings seal).
I'm looking to get a drain cleaning hose for it, and wondering if I'll have trouble matching the coupling?