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74mm OD Balboa Gecko Spa Heater Gasket O-Ring Seal - Pair

$9.90 $11.00
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"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 GeckoAEware, 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. 


  • 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

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