Prier's 12 in. Anti-siphon C-144D12 features a 1/2 in. MPT x 1/2 in. SWT inlet and a 12 in. insertion length. The C-144 provides a year-round source of water to areas of structures that are subject to freezing temperatures. The hydrant valve is connected to the supply piping in the heated portion of the structure, eliminating the possibility of freezing. The Prier C-144 Diamond Series has all the characteristics of the historically proven C-134 with the added protection of an anti-siphon vacuum breaker and backflow check valve. It is available in stock lengths from 1-1/2 in. to 24 in. with longer lengths available on request. Easy to install and maintain. Designed to last the life of the plumbing system.