1 pcs of horizontal check valve, 1 1/2", DN40, Brass non return valve This listing includes 1 pcs of ... horizontal check valve, 1 1/2", DN40, brass. (SIZE: we have DN15, DN20, DN25, DN32 ... ,DN40,DN50, you can choose which one you need) DNSIZELHd151/2" ... below: 1 pcs of horizontal check valve, 1 1/2", DN40, Brass non return valve