There are two types of BIGboy O-rings. The one that you choose depends on the system you have: old or new. See the image below to determine if you have a grooved O-ring for the new system or Non-grooved O-ring for the old system.
- Dimensions (H x W x D): .25" x 6.125" x 6.125"
- Weight: 0.025 lbs
- Tariff: 8421990040
Part Number: HL 23037