Replacement o-ring fits RA adapters (round) and stackable height extensions with a 2″ pin.  This o-ring fits the following adapters and extensions:

• FJ6225, FJ6202
• FJ7880, FJ7880BBK
• FJ6171-1, FJ6171-2

OR Save 40% when you order an 8-pack of these o-rings.

Note: Despite having the same pin size, this o-ring does not fit TA adapters – use this one instead.