This is a valveless version for pressure washers.
Flat Face Stainless Steel + Viton Coupler, interchangeable with Stucchi (Holmbury) FL.
Enerpac Interchange - TP3 Series Screw Couplings Nipple
Snaptite 71 Series (Steel) Nipple (BSPP/NPT).
Snaptite H Series (Brass) Nipple (BSPP/NPT), valved and unvalved.