Maxitrol 325-5L-1/2-12A39 1/2" Line Pressure Regulator with Limiter functions as an HVAC systems part that controls gas pressure to maintain operational safety and consistency. The 1/2" regulator operates at 2 PSI pressure which makes it suitable for residential and commercial heating system pressure control. The regulator includes an integrated limiter that protects against excessive... https://www.partshnc.com/325-5l-1-2-12a39-maxitrol-1-2-line-regulator-w-limite-2psi