Prier 6 in. L 1/2 in. MPT x SWT, 478-06 Series Heavy Duty, Frost-Proof, Anti-Siphon Sillcock is connected to the supply piping in the heated portion of the structure, eliminating the possibility of freezing. The Prier 478 Series features an anti-siphon vacuum breaker and backflow preventer with a solid brass body and seat. Designed to be easy to install and maintain. Built to last the life of your plumbing system. 478-06-BULK is BULK Packaged in 24 case count, no individual boxes. Each valve is individually labeled and barcoded. Great for retail shelves. Must be ordered in 24 case count.