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 ... to ISO 228 standard Diagram as below: 1 pcs of horizontal check valve, 1 1/2", DN40, Brass non return valve