Amazon.com: Rego 1/2" Relief Valve | 35 PSI | Non-ASME | Tamper Resistant | Brass Material | Primarily Designed for Vapor Line Safety in Gas and Cryogenic Systems | Oxygen Service per
Pressure Relief Valve (PRV)
NRV and NVRT Series In-line Air and Gas Pressure Relief Valves | ISM
TPR Relief Valve Discharge Tube Codes & Hazards Installation, inspection, & specifications for discharge tubes on TPR valves used on boilers & water heaters