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Small black rubber O-ring for HEATKILLER Tube standard top replacement seal

Watercool

Watercool WAT-0087 O-Ring for HEATKILLER Tube Standard Top

SKU CH-017Z-EKPBV

Replacement gasket that seals the standard top of a HEATKILLER Tube reservoir

  • Key featuresThis O-ring is a replacement gasket for the HEATKILLER® Tube
  • Replacement gasket for HEATKILLER Tube standard top
  • Restores seal on original big single fillport top
  • Direct fit for HEATKILLER Tube Standard Top
  • Supplied as single O-ring for quick maintenance
  • Keeps custom loop leak-free with genuine part

Replacement O-Ring for HEATKILLER Tube Standard Top

This O-ring is a spare gasket designed for the HEATKILLER® Tube standard top. It fits the original big single fillport top used in custom liquid-cooling loops. The part is sold individually as item WAT-0087. It addresses seal wear that can cause coolant leaks.

When to Replace the Fillport Seal

Replace the gasket when the original seal shows cracking, flattening or loss of elasticity after repeated disassembly. The jump is worth it if you notice seepage around the fillport or plan routine loop maintenance. It restores the factory seal without replacing the entire top assembly. Buyers needing a different top variant or multiple seals should verify compatibility first.

Installation Notes and Common Issues

Installation requires removing the fillport top, cleaning the groove, and seating the new O-ring evenly without twisting. The most common issue is pinching the gasket during reassembly, which creates a leak path. Over-tightening the top can also deform the seal. No tools beyond standard hex keys are typically required. Builders unfamiliar with loop disassembly should follow a guide.

How it compares

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Price $8.99
Cheaper than about 92% of the 8,339 comparable items (median $19.99).

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Specifications

Product
Brand nameWatercool
Model nameWAT-0087
Part numberWAT-0087

Questions about this item

Which HEATKILLER Tube top does the WAT-0087 O-ring fit?

The WAT-0087 O-ring is made for the HEATKILLER Tube standard top and replaces the seal on the big single fillport top.

How do you install the O-ring without damaging it?

Seat the O-ring evenly in the top groove by hand; do not stretch it over threads or use tools that can nick the rubber.

When should the O-ring be replaced?

Replace the O-ring whenever the top is removed for cleaning or if you see flattening, cracks or coolant seepage at the seal.

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