Top Plug Bottom Plug Aluminum Cementing Plugs Industrial Rubber's Aluminum Cementing Plugs are engineered for strength and dependability down a Big Hole. These Plugs permit the use of   conventional cementing methods with 16, 18 5/8, and 20-Inch Casings Plugs feature three self-centering cups and wiping elements bolted to an all-aluminum core. The one-piece cup and wiper elements are of resilient 70 durometer natural rubber. Differential pressure across the plug forces both wipers and cups firmly against the casing wall to assure a good wiping job all the way to the bottom of the hole. The all-aluminum core eliminates distortion from pressure in a deep hole and gives solid support to a long column of cement slurry or drilling fluid. The bottom cup design provides a positive shut-off when it seats on the float. Plugs are PDC drillable. The strength of these plugs eliminates the damage often caused  to large wooden plugs by rough handling.   Cut-Away Example of a Bottom Aluminum Plug In the bottom plug, all rubber cups and the top plate have a center hole 3 1/2 inches in diameter, and a solid rubber diaphragm across the top-most cup will rupture when sufficient pressure is applied. In the top plug all rubber cups and the top plate are solid.   Specifications for Aluminum Cementing Plugs   16 Inch Plug 20 Inch Plug       Length 19 1/2" 19 1/2" Width across cups 15 3/4" 19 7/8" Cups 1" Thick 1" Thick Cup Height 2 1/2" 2 1/2" Weight 95 lbs. 117 lbs.   Aluminum Cementing Plugs Top Aluminum Plugs   Bottom Aluminum Plugs       BLACK   RED Size Part Number   Size Part Number   Size Part Number 16" 140-0160   16" 141-0160   16" 141-0160R 18 5/8" 140-0185   18 5/8" 141-0185   18 5/8" 141-0185R 20" 140-0200   20" 141-0200   20" 141-0200R   The Aluminum Alloy used in these Cementing plugs is PDC Drillable! (Downloadable PDF)