D-rings prevent twisting, rolling and spiral failure often seen when O-rings are used in reciprocating applications; available in standard O-ring sizes and custom sizes.
D-Ring Seal, Standard and Customized Sizes
390PC Fluorine rubber Ring Green FKM O Rings Kit 30Sizes O-ring Seal Rubber Washer Gasket
T-Seals from Precision Polymer Engineering
Quad-Ring® Brand Seals - Minnesota Rubber & Plastics
O-Ring Seals, Rubber O Rings for High Temperatures
D-Ring Seal, Standard and Customized Sizes
O-rings are one of the simplest yet most engineered precise and useful seal designs ever developed. O-rings are available in various metric and inch
1.13 in. D X 0.31 in. D Rubber O-Ring
O-ring - Wikipedia
Rubber Sealing Gasket Rings Kit Nitrile O ring Washer - Temu