This is a valveless version for pressure washers.
Enerpac Interchange - TP3 Series Screw Couplings Coupler
Snaptite H Series (Stainless Steel) Nipple (BSPP/NPT), valved and unvalved.
Gromelle Interchange - TGW Series Nipple.
DIN Standard - PDV-O Series Coupler, valveless version for pressure washers