ENGINEERING SPECIFICATION: ZURN Z1321XL Encased, EcolotrolTM, lead-free, non-freeze automatic draining wall hydrant for flush installation.Hydrant features integral backflow preventer with anti-siphon technology,copper casing, all-bronze interior components with 1/2 turn long-life ceramic disc cartridge,combination 3/4” [19] female solder and 3/4” [19] male pipe thread inlet connection, and 3/4” [19] male hose connection. Hydrant furnished with type 304 stainless steel housing with locking hinged cover stamped "WATER” and includes operating key Zurn "XL” Lead-Free compliant products are a line of durable plumbing products designed and manufactured to comply with state laws and local codes that mandate maximum allowable lead content levels. Zurn "XL” products are manufactured in accordance to the Federal SWDA section 1417