Caleffi NA553369 Boiler Trim Kit 1" Sweat 30# Tank

The Caleffi NA553369 Boiler Trim Kit is designed for hydronic boiler systems, combining essential piping and pressure management components into a single coordinated unit. It has a 1-inch sweat and air filter, expansion tank, autofill and backflow assembly, check valve, and connected fittings to simplify boiler setup and system integration in HVAC systems. It is placed near the boiler and it supports proper air elimination, automatic water supply, expansion control and backflow protection during normal operation. It integrates with the boiler and distribution piping to maintain stable system pressure improve circulation accuracy and ensure consistent performance in heating application.