The Hurlcon 76121 Gasket Tube Seal 9-Pack is a critical replacement part for maintaining the integrity and performance of AstralPool MX and Viron gas pool heaters. Designed to seal the manifold-to-heat exchanger connection, these gaskets help prevent leaks and ensure efficient heater operation.

Please note:  

This pack of 9 has superseded the part number 76120.

Only genuine AstralPool/Hurlcon 76121 tube seals will correctly fit MX, Viron, HiNRG and Jacuzzi J‑HN heaters. Generic washers look similar but do not seal, causing leaks and internal heater damage. Always use the correct OEM part for safe operation.

Part Number: 76121 

Pack Size: 9 seals

Compatibility: 

  • MX Series Gas Heaters 

    • MX125 / MX150 / MX200 / MX250 / MX300 / MX400

  • Viron

    • 150 / 250 / 350

  • HiNRG models with copper or cupro-nickel heat exchangers.

    • 175 / 250 / 400

  • Jacuzzi J‑HN series

Installation Notes

  • Commonly required when servicing or replacing the inlet, outlet, or return manifolds.

  • A complete manifold rebuild generally uses 18 seals, so two packs are needed.

Part No 20 as below:

hurlcon-mx-heater-2000.png

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SKU 76121
Barcode # 9343609011086
Brand ASTRALPOOL
Shipping Weight 0.0500kg
Shipping Width 0.270m
Shipping Height 0.010m
Shipping Length 0.190m
Type Genuine

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