UTEX UNILITE SEAL 1-7/8|Utex's Unilite mechanical seal is a unique, non-metallic seal. It features a metal collar insert that protects the composite material when the set screws are tightened, making this a uniquely rugged design for the field. It uses no setting clips, so it is easier to install than other seals. It is made of a polyphenylene sulfide non-metallic composite, and offers high chemical resistance.