Hayward HAXBPK1932 By-Pass Valve Kit Replacement for Hayward H-Series Millivolt Electronic ED1 Style Pool Heater By-pass valve kit replacement Fits hayward h-series millivolt electronic ed1 style pool heater models h2001, h1501, h2501 Used on heaters made before 10/28/2000 Weighs 12.2 lbs By-pass valve kit replacement Fits hayward h-series millivolt electronic ed1 style pool heater models h2001, h1501, h2501 Used on heaters made after 10/28/2000 Weighs 12.2 lbs