The 3" to 4" Inflatable Long Water/Air Test Plug from Braxton Harris Co Inc is a versatile tool for plumbing and drainage testing. This inflatable plug is designed to seal pipes ranging from 3 to 4 inches in diameter, allowing for effective water or air pressure testing. Made from durable rubber, it provides a reliable seal to prevent leaks during testing. The plug is easy to inflate and deflate, making it convenient for quick setups and takedowns. Ideal for contractors and plumbers, this test plug meets industry standards for safety and performance.