DSI 771477 EPDM Check Valve Seat, Gasket, O-Ring, 26mm OD 6mm ID 6.5mm Thick
The original intention for these was a gasket for a check valve.
Seeing how they are EPDM, they can be used for a variety of purposes.
They'd make excellent bumpers as well!
High quality product from Germany.
Fast US Shipping
30-day warranty.