Jones Stephens 200 PSI Sillcock/Water/Gas Test-Gauge Brass 3/4-in Fip Pressure Relief Valve in the Pressure Relief Valves & Regulators department at Lowes.com
WATTS® 0009100 12U5B | Porter Pipe & Supply Company
10-624-100-Conbraco 10-624-100 Water Relief Valve 3/4" 100psi - Industrial Stores