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The Watts HPX-15D is a expansion tank.
This combination boiler trim out package is designed for use on commercial and residential closed loop hydronic heating systems. It consists of an expansion tank, model ETX-15, 1 1/4 inch cast iron air separator, a bronze combination fill valve and backflow preventer, B911S, a boiler fill valve fitting RBFF, 1/8 in and 1/2 in service check valves, SCV, and a 1/8 inch automatic air vent valve, model FV4-M1. This package provides an economical solution for buying boiler components.
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