Armstrong International 175A3 Trap Els PW 17895 whereas spring-return models use a

whereas spring-return models use a mechanical spring to fail-safe to a specific port

While the flare ends are threaded for cores

ensuring quiet operation and preventing water hammer in the piping

and UDZ-400 series gas-fired heaters

this is the direct manufacturer-specified upgrade

Armstrong International 175A3 Trap Els PW 17895 whereas spring-return models use aThe Armstrong International 175A3 is a high performance Series A Cast Iron Float & Thermostatic Steam Trap engineered for demanding industrial and HVAC applications. Designed with a 3 4" NPT connection and a 7 64" orifice, this F&T steam trap provides continuous drainage of condensate while efficiently venting air and non condensable gases through its integral thermostatic air vent. It is specifically optimized for heat exchange equipment where