Viton full-face gaskets cover the entire surface area of the flange and include holes to insert flange bolts and ease alignment. The gasket extends to the outside diameter of the flange which prevents dirt and contaminants from entering the joint. These gaskets are typically used with flat-face (FF) flange fittings so that the mating flange components fit flush against the gasket. Full-face gaskets require the joint to be disassembled to install.

Viton ring gaskets sit against the internal edge of the flange, around the pipe bore, and inside the bolts. They are typically positioned onto the raised surface of a raised-face (RF) flange. Ring gaskets install by dropping them into the flange fitting without fully disassembling the joint.