Pentair Coil/Tubesheet Sealing O-Ring Kit | Max-E-Therm 400 & MasterTemp 400 Heaters | 77707-0119 PS3868 Replacing worn or cracked unions

Replacing worn or cracked unions at service time restores a leak-free seal at the pump's plumbing connections

locate the date code on your heater's rating label — typically found on the inside of the heater cabinet door or on the rear panel

This listing is for 1 cartridge

This listing is a kit containing a washer and gasket — not a complete light assembly or fixture

Pentair Coil/Tubesheet Sealing O-Ring Kit | Max-E-Therm 400 & MasterTemp 400 Heaters | 77707-0119 PS3868 Replacing worn or cracked unionsThe Pentair Coil Tubesheet Sealing O Ring Kit (77707 0119) is the OEM replacement O ring set for the water system coil and tubesheet sealing points in the Max E Therm 400 and MasterTemp 400 series heaters. This kit contains 12 O rings the complete set required to service all coil tubesheet sealing positions in the 400 model heat exchanger assembly. IMPORTANT: KIT OF 12 O RINGS NOT A SINGLE PIECE This listing is a kit of 12 O rings. All 12 are required