25PCS Waterproof O-Ring Watch Back Seal Gaskets Watch Repair Tool 0.5mm/0.8 mm | eBay
00-1260-52: Wilden O-ring used in 0.25"-0.5" Pumps, Buna | Wilden Store
Value Collection - O-Ring: 0.375″ ID x 0.5″ OD, 0.07″ Thick, Dash 012, Nitrile Butadiene Rubber - 79285037 - MSC Industrial Supply
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