Darlly 50257 FC 1330 C 5601 PJW23 Spa Pool Filter Cartridge guangdong and 240 volt relationship give and 240 volt relationship give this heater practical value because electric heaters work best when they match the intended power configuration and system demand closely The Raypak front control panel is designed for compatible 266A and 267A heater applications where the supported front facing control interface needs replacement Helps restore dependable filtration performance The multiple reference numbers give this cartridge practical value because replacement filters are most reliably selected by matching known cross reference identifiers to the intended housing