100 extra-large watch case back gaskets (O-rings), an assorted 32-50mm rubber seal kit for oversized wristwatches.
⭐ At a glance
📏 Assorted sizes from 32mm to 50mm — more larger sizes than smaller
📦 Pack of 100 rubber gaskets
Colour: Black
✔️ New with tags
✅ Fits
Suits larger wristwatch case backs needing a round rubber seal between 32mm and 50mm. Sizes within the pack are assorted and not evenly distributed — expect a greater number of the larger diameters, so it's worth buying a full pack rather than relying on hitting one exact size.
🔧 What it does & how to use
These O-ring gaskets seal the watch case back against dust and moisture, and are a routine replacement whenever a case back is opened for a battery change or service.
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Select a gasket: pick the O-ring from the pack that matches the diameter of the original seal or the case back groove.
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Check the fit: the gasket should sit snugly in the groove without stretching or bunching.
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Apply grease (optional): a thin layer of silicone grease on the gasket helps it seal better and extends its working life.
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Fit and close: seat the gasket in place, then refit and secure the case back.
⚠️ Please check the exact diameter you need against your existing gasket or case back groove before fitting, as sizes in this pack are assorted and not evenly spread.
