“50mm” (74mm OD) Balboa / Gecko ribbed heater o-ring gasket seals (comes in pair) to fit all Balboa M7 & non-M7 Heaters and many others including Gecko, AEware, Hydroquip, Aquatemp, RMF, and others. May be black, white, or clear material. Should be replaced every few years, or when there has been a chemical balance problem.
Measurements:
- Outside diameter: 74mm
- Inside diameter: 53mm
- Total Thickness: 6mm
- Square edged O-ring side – diameter of raised ring centre to centre: 63mm
May Have Part Numbers:
- 711-4031, 21619, B-21619, RGASHEA50M
Used in:
- Gecko Microspa, SSPA, MSPA and others
- Balboa GS, GL, EL, BP, Dominator and many others
Oring, o ring
Balboa Heater Gasket – 50mm