Beckson Pry-Out Deck Plate. Beckson developed the first pry-out deck plate as an access cover to its permanently mounted pump. These pry-out plates were designed with an extra heavy O-ring to assure a water tight fit.. Pry-out plates should be installed in areas where internal pressure (oil-canning) is not present.. Dimensions:. Outside Diameter: 10". Inside Diameter: 8". Hole Cut: 8 1/2". Color: Beige. Center Style: Dimple