mechanisms 40 or increasing the number thereof much larger and elongated openings are readily accommodated in summary the present invention provides a novel access opening closure device which embodies unitary construction the device is self securing by means of independently operable laterally extending retention arms each lateral retention arm consists of a cantilevered using member hinged at its supported interior end and extending outwardly from the center of the obverse side of the faceplate to the periphery in the same plane each retention arm has a spring bias to provide positive positioning prior to installation the angle of the retention arms is inclined by means of pressure applied to a screw placed midpoint between the hinge and distal end of the cantilevered wing member and closed by tightening the screw into the wing member transmitted to the distal end by drawing that end into coactive relationship with the faceplate to form a vice while firmly grips the intervening wall surface therebetween and draws the device into a flush relationship relative to the outer wall surface the sealing gasket when used is compressed between the obverse face of the device and the outer wall surface to render the closure leak resistant the device further comprises a beveled edge around the entire periphery of the faceplate which lends structural support and enhances gasket retention the device requires no additional structure or support to function the device is removable and can be re installed as desired from the foregoing.