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ZWO Seestar S30 Desktop

This replacement rubber O-ring fits the Sky-Watcher 9x50 finder scopes and holds the finder securely in its mounting bracket. Over time, the original O-ring can dry out, crack, or lose elasticity. Replacing it ensures the finder remains properly seated and stable. Made from durable nitrile rubber for long-lasting use. Has an inner diameter of 52mm, and a thickness of 1.5mm.