formed with the plate 27 as a practical matter the plates 26 and 27 with the posts 40 and 41 extending therebetween may be molded or cast as a unit and then one of the plates disconnected by cutting or the like from the posts 40 and 41 and the receptacle means 35 formed therein in any suitable manner the post ends may be also formed in any configuration to be received within receptacle means 35 the recesses 37 are of suitable extent as is the opening 36 to accommodate relative movement of the elastomer body 25 due to engagement of the front of the seal with the member 15 or for any other reason while retaining the units interconnected but preferably enabling the plates 26 and 27 to remain disengaged or disconnected so as to assure proper relative movement therebetween and relative to body 25 during use this arrangement provides a seal arrangement that accommodates the necessary expansion and contraction of the elastomer body during the molding or during use as well as relative movement between the components during use it also inhibits separation of the plates 26 and 27 from the elastomer body during use as such arrangement enables the plates 26 and 27 to move with the body 25 as a unit during any expansion or contraction and places them in a relationship to interconnect if the elastomer completely disappears it can also be appreciated that while the present invention has been.