HAXBPK1931 Pool Heater By-Pass Kit - Replacement for H-Series Millivolt ED1 Style Heaters H2001, H1501, H2501 - Pre-10/28/2000 Models

【Direct Replacement】: Specifically designed as a direct replacement for HAXBPK1931 by-pass kits; compatible with H-Series Millivolt Electronic ED1 Style Pool Heater models H2001, H1501, and H2501; ensures a perfect fit and easy installation. 【Pre-2000 Compatibility】: Intended for use with pool heaters manufactured before October 28, 2000; confirms accurate functionality with older H-Series heater models; provides a reliable solution for maintaining vintage equipment. 【Optimal Water Flow】: Facilitates proper water flow and system balance; contributes to efficient heater operation; helps prevent overheating and ensures consistent pool temperature control; vital for system longevity.