COB Industries Inc, has a pipe plug for almost every application. From 1/2" to 96" diameters and 0 PSI to 10,000 PSI, COB can answer all of your pipe plug needs. Multi-sized inflatable plugs will cover a broad range of pipe sizes with a single plug. Bag Plugs provide a foreign material or gas barrier for many different pipe applications. Our mechanical wing nut style plugs offer and economical way to block off or test low pressure applications through 36" in diameter. The Qwik Sealfast plug provide an additional level of security when testing up to 96" diamenter pipe with their internal bracing lugs. Viton, Silicon and Nitile seals are available to chemical and high temperature applications. If we don't have it in stock you can be sure we probaly made it before and can quickly and efficiently make any plug for your application.