SEAL RING FOR PLUG

摘要

A seal ring for a plug, which, when used in a plug cap, can be used regardless of kind of chemical liquid and has no possibility of damaging a seal surface of the plug in tightening the plug cap. The seal ring is placed in the plug cap installed on the plug having a liquid path and/or a gas path, and the seal ring achieves liquid sealing and/or gas sealing of the plug. The seal ring (1) has on its upper surface an edge seal section (17), on its inner surface a surface seal section (18), and on its outer surface a projection section (19) engaging with a ring engagement section (16a) formed on the inner surface of the plug cap.