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Heater Coupling Gasket 2" 21619

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  • heater gasket for hot tubs
  • heater gasket for hot tubs
  • 21619
Now: $2.97
RRP: $3.95


Heater Coupling Gasket, 2". This is the gasket needed on either side of the flow through spa heater to keep water from leaking into the spa cabinet.  When replacing the spa heater, also replace the 2 heater gaskets.

This gasket fits the two inch heater tailpiece with an indentation to accommodate this seal/gasket.

Part Type Gasket
Inside Diameter 2-1/8"id
Outside Diameter 2-7/8"od
Kit No
Application - Category Heater, Flo Thru
Application Manufacturer Balboa
Application - Part Union
Manufacturer Part Number 21619

Get replacement heaters, heater parts and gaskets from Hot Tub Outpost.

This gasket has ridges on both sides.

gasket side 1
One side has a larger ridge

gasket side
The other side has a smaller integrated o-ring.  Very popular heater gasket for 2 inch flow through heaters.

See more heater gaskets and o-rings.

Add spa chemicals - filters to your order and get to the free shipping threshold.

We also offer heater tailpieces like 2 inch buttress thread x 2 inch slip 417-5040.

Or tailpiece 2 inch buttress x 2 inch spigot/1 1/2 inch slip 417-5160

Or the tailpiece 2 inch buttress thread x 1 1/2 inch slip for split nut 417-2090.  A heater split nut would be 0121108020.

This is a very popular heater gasket used in a wide variety of spas including Clearwater Spas and Divine hot tubs.

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