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

The NK300S-100 Boiler Feed Combination Valve reduces installation costs and saves time in boiler applications by combining multiple devices into one product that fits into a smaller footprint. This product contains an integrated pressure reducing valve, double check backflow preventer with air vent, two shut-off ball valves, pressure gauge, and conveniently located test ports for easy inspection and check out. Includes: TK300-30 Expansion Tank PV100 Automatic Air Vent (1-1/4" NPT) SCV-050 Service Check Valve NK300S-100 - Boiler Feed Combination Valve