Replacement O-Ring for Quick Connect Fittings
These John Guest replacement o-rings restore proper sealing on quick connect fittings used throughout residential and commercial water filtration systems. Available in 1/4", 5/16", 3/8", and 1/2" sizes with AS568 standard dimensions, each o-ring is manufactured to the same specifications as original equipment components.
Dimensional Reference
| Tubing Size | AS568 Standard | OD | ID | Cross Section |
|---|---|---|---|---|
| 1/4" | AS568-108 | 7/16" | 1/4" | 3/32" |
| 5/16" | — | — | — | 3/32" |
| 3/8" | AS568-110 | 9/16" | 3/8" | 3/32" |
| 1/2" | — | — | — | — |
Compatible Systems
These o-rings fit John Guest quick connect fittings including models CP-R08I-S (1/4"), CP-R12I-S (5/16"), CP-R16I-S (3/8"), and CP-R08M-S across reverse osmosis systems, inline water filters, ice maker connections, refrigerator lines, and point-of-use filtration equipment. Replace o-rings during routine maintenance or when connections show signs of seepage or reduced seal integrity.
Proper o-ring replacement maintains system pressure and prevents contamination at connection points in any John Guest-equipped water system.
