What is the difference between the 460 PSI and 325 PSI settings

For residential and light commercial air handling applications

providing a direct-drop replacement that restores original CFM specifications to the terminal equipment

it utilizes an internal fan to dissipate heat

While the regulator features an adjustment handle for setting the 7-60 PSI range

Conbraco 18C-542-4-125 Valve 340155-7024 What is the difference betweenThe Conbraco 18C 542 4 125 is a high capacity temperature and pressure relief valve engineered for heavy duty protection of commercial hot water storage tanks and large scale boilers. This ASME Section IV certified valve features a rugged bronze body and stainless steel springs, ensuring long term seat integrity in demanding hydronic environments. With a 1 1 2" Male NPT inlet and 1 1 2" Female NPT outlet, it provides a substantial 5,125,000 BTU hr