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Cherne Schedule 40 Sure-Grip Plugs can be installed without tools and are ideal for both water and air testing of plumbing systems or blocking stub-out lines as a temporary or permanent plug. These plugs are engineered to fit plastic and metal, and are made up of polypropylene and natural rubber for durability, excellent expansion, and sealing. Cherne Schedule 40 Sure-Grip Plugs can be used for extended and temporary applications, and may be tapped for use with cleanout cover. Cherne Schedule 40 Sure-Grip is offered in three variations of sizes: 2", 3", and 4".