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The PRIER PRODUCTS 378-04 is a 4-inch frost-free wall hydrant designed to protect outdoor water supply lines from freezing and bursting in cold weather. The valve seat sits inside the heated envelope of the building, so water drains from the exposed barrel automatically when the hydrant is closed. The body is nickel-plated red brass for corrosion resistance, and a large no-slip PVC handle opens and closes the valve in a single turn. This hydrant is installed by licensed plumbers in residential and light commercial applications where a reliable year-round outdoor water source is required.
The 378-04 is suited for exterior wall installations where freeze protection is needed without additional interior stop valves or dedicated drain lines. The inlet connection is 1/2 inch sweat (SWT) for copper pipe, and the outlet is 1/2 inch IPS for standard threaded hose or fixture connections. An exclusive wedge insert is included to accommodate lap siding installations, making the flange seat flush against angled exterior surfaces. This hydrant eliminates the seasonal task of draining and shutting off outdoor faucet lines.
Designed as an OEM-style replacement or new-installation wall hydrant for residential and light commercial plumbing systems requiring a frost-free outdoor water supply point with 1/2 inch sweat inlet connections.
Installation should be performed by a licensed plumber in accordance with the International Plumbing Code (IPC) and applicable local codes. Shut off the interior water supply and depressurize the line before soldering the sweat connection. The hydrant must be pitched slightly toward the exterior so the barrel drains fully when closed. Do not install with the barrel pitched inward, as this will defeat the frost-free function and allow water to remain in the exposed section.
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