Junio 240SRX-Ring Joint Gasket is t he same in design to the RX Ring . To distinguish from Junio 240RX-Ring Type Joints the suffix s is used to indicate the additional pressure passage hole in the ring cross section. This is to indicate the additional requirement to prevent pressure lock when connections are made up underwater. JUNIO SRX Ring Joint Gaskets are manufactured in different solid metal types like soft iron/SS304/316/321 metal and other alloy items.