Pair - 74mm OD "50mm" Balboa / Gecko / Aeware Spa Heater Gasket O-Ring Seal - Pair

PAIR (two) Balboa / Gecko ribbed heater o-ring gasket seals 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. 

Referred to as 50mm or 2" Gaskets - Note that "50mm" refers to the plumbing and the gaskets do not actually measure 50mm or 2". They measure approximately 74mm outside diameter.

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 Aeware, in.yj, in.ye, in.xm, Microspa, SSPA, MSPA and others
• Balboa GS, GL, EL, BP, Dominator, Revolution and many others
• Hydroquip & Pentair spa controllers
• Spa Builders

Oring, o ring, Balboa Heater Gasket - 50mm / Gecko Heater Seal