Newington, CT Insta-Plumbâ„¢ by Plumb Pak is the newest push-fit technology for undersink tubular drainage. No solvents, glues or nuts and washer, a simple push-fit application for traps, drains and couplings. Insta-Plumbâ„¢ tubular products feature a stainless steel grip ring that holds the connection tight and an O-ring that provides a leak-free seal, you can install with confidence. Our tubular program makes it faster and easier to install than conventional slip nuts and washers or glue.