santoprene u00ae available from santoprene inc a limited partnership of exxon mobil santoprene u00ae having a durometer of 30 is particularly preferred to make the inner component 10 the olefin polymer such as polyethylene is first molded and then used as a core for making the covering of santoprene u00ae the mold for shaping the santoprene u00ae is larger than the core permitting the santoprene u00ae to encapsulate the core when the santoprene u00ae fills the over mold cavity over molded material having a durometer from 25 to 40 are suitable materials satisfying such durometer values and include aluminum stainless steel or polymers such as polyethylene or polycarbonate the inner component 10 of the ova 201 provides vital support for the adapter as well as providing the interference fit designed to fit the range of ovb diameters the inner component 10 also includes the conduit 16 which is used to connect the quick disconnect fitting 18 of pressure tube 20 the outer component 12 can also be injection molded from a polymer such as an olefin preferably polypropylene this component 12 has sections cut away or formed as apertures 24 and 25 preferably with slotted cammed surfaces that will engage projections such as the drink tube 26 and outlet valve cover tab 28 of outlet valve body 14 on the joint service m45 mask 100.