18C521
Bronze Auto Temp & Pressure Relief Valve, 125/150 PSI, 1" MPT x FPT
What I noticed is that Thermal Transfer Products LTD parts rarely need replacement.
Apollo 18C5213125 1in 125 PSI T&P Bronze MNPT x FNPT Relief Valve
What stands out about the NOWG1G NO WAX Gelcoat is its chemical resistance.