DUI replacement zip neck seal. Use this for replacing current DUI neck seal when it wears out. G1 Seals have two sets of ZipSeal locking channels either side of the seal to be used with Generation 1 Neck Rings G2 Seals have only one set of ZipSeal locking channels on the inside of the seal. These are to be used with the Generation 2 Locking Neck Rings.