A81 Felt Valve Washers vs Midwest Felt Cushioning Washer 30 Pack

These are not the same part. The A81 is a small 1/2 inch outer diameter wool felt washer for instrument valve repair, sold in bulk by a repair supply house. The Midwest washer is a 5/8 inch outer diameter felt cushioning washer sold in a 30 piece pack. Buy the A81 if you are repairing a musical instrument and need the exact 3/16 inch bore. Buy the Midwest pack if you need general felt cushioning washers for fasteners and hardware. They do not interchange.

• Choose the A81 if you need a 1/2 inch outer diameter, 3/16 inch inner diameter wool felt washer for instrument valve work and want color options.
• Choose the Midwest washer if you need a 5/8 inch outer diameter felt washer with a 15/32 inch bore for cushioning around a 5/8 inch bolt.