Crystal Gaskets: Small Part, Big Job

The Seal Between Crystal and Case

Crystal gaskets create the waterproof seal between your crystal and case. They are cheap, invisible, and absolutely critical.

What They Do

• Seal the gap: fill the space between crystal edge and case seat
• Enable compression: the crystal press compresses the gasket, creating the watertight fit
• Absorb shock: slight cushioning protects the crystal from case flex

Gasket Sizing

Gaskets are specified by inner diameter, cross-section thickness and material. Match all three to your crystal and case — a gasket that's slightly undersized won't seal; oversized won't let the crystal seat.

When to Replace

• Every time the crystal comes out — gaskets take a compression set and don't reseal reliably
• Before any water-resistance-dependent use after a build

Frequently Asked Questions

Can I reuse the old gasket if it looks fine?
Risky — compression set isn't always visible. A few dollars of gasket beats water damage.

Where do I get the right size?
Match to your crystal and case specs. Our case listings state compatible gasket sizes.

See also: our gaskets overview.