Check your original part for the "L165-20" or "626432" stamping to confirm

This is an auto-reset model

Enhanced thermal contact prevents overshoot and protects expensive system components from thermal stress

Integration with other series may result in improper stroke or seat loading

it is precision-formed for specific Weil-McLain models

Conbraco 37LF-201-01 Valve Check your original part forThe Conbraco 37LF 201 01 is a lead free 1 2" vacuum relief valve engineered for heavy duty commercial and residential water heating systems. This model is the direct replacement for 37 201 01, providing a seamless retrofit into existing piping layouts. Designed to automatically admit air into the supply system, it effectively prevents vacuum conditions that can lead to tank collapse or siphoning. It features a high 15 CFM venting capacity and is rated