The Pressure-Core™ Seal consists of
an outer Teflon® shell with an elliptical
shaped Viton® O-ring core. The
encapsulated core is “live-loaded” and
provides constant outward pressure
against the Teflon® shell, which flexes
under pressure like an O-ring. The
Teflon® shell offers the desired chemical
resistance without periodic gland
tightening as in conventional designs.