Retainer Rings 3 pack of aftermarket lid retainer Rings Seals for 3 pound Thumler's barrels used on models T, MP-1, A-R1 and A-R2. They not only far exceed the OEM specs but also exceed any other ring you can buy. They are proudly made in America for Bar27 Innovations. If you don't agree it's the best ring you've ever used return it for a full refund. Not the cheapest, simply the best God Loves You