Resideo NK300S Boiler Trim Kit w/ Check Valve, 1-1/4" Press Air Eliminator, Press Boiler Feed & 4.4 Gal. Expansion Tank

Rather than taking the time to locate and purchase the pieces separately, the boiler trim kit gives you all the accessories needed for a boiler installation. Each kit includes an Expansion Tank, a Boiler Feed Combination Valve, a SuperVent Air Eliminator or an Air Purger/Vent, and check valves. It’s a complete, time-saving solution in one handy box — just add water. Product Features Expansion Tank: Welded, not clamped, for longer, leak-proof life. Check Valves: Allows replacement of expansion tank and/or air vent without draining the heating system. SuperVent Air Eliminator or Air Purger: Optimal air removal from hydronic systems. Boiler Fill Valve (NK300S shown): Double check backflow preventer/boiler feed valve combo (NK300S) or DialSet boiler fill valve and dual check atmospheric backflow preventer (FM911). Product Specifications Size: SuperVent 1", Tank 1/2" Connection Type: Tank: Male NPT, SuperVent: ProPress Height: 15-1/2" Volume: 4.4 gal. (16.7 L) Weight: 16 lb (7.3 kg)