You can count on Davis Valve to have the boiler stop check valve you need when you have a boiler down. All Davis stop check valves comply with the applicable requirements of Section 1, Power Boilers, ASME Boiler and Pressure Vessel Code. Cast iron stop checks are available in 2 1/2″ through 8″ both in angle and straightway styles. Steel stop checks are available in 3″ through 12″ both in angle and straightway styles. Hammer blow hand wheels are standard on valves 6″ and larger.