Cherne ® 8" Inside-of-pipe Gripper ® Plug,17 PSI - 40 ft.

The Cherne 8" Inside-of-Pipe Gripper (part #270-288) is the largest mechanical Inside-of-Pipe Gripper in the Cherne line — built for internal sealing of 8" sewer and storm drain pipe. Rated for 17 PSI / 40 ft. head pressure. Fits 8" Schedule 40 and Schedule 80 PVC, ABS, and cast iron pipe (usage range 7.70"–8.03" ID). At 2.60 lbs with a 3-3/4" body, it provides a solid mechanical seal deep inside large-bore pipe. Glass-reinforced ABS body with natural rubber O-ring — wing nut expansion, no inflation or gauge required.

Key Features

• Inside-of-pipe design — position the plug at any depth inside the pipe, not just at the end
• 17 PSI / 40 ft. head pressure — meets code requirements for DWV and sewer air tests
• Mechanical wing nut expansion — no inflation needed, no gauge to carry
• Natural rubber O-ring — seals round and out-of-round pipes with excellent memory
• Zinc-plated hardware — carriage bolt and extra-large wing nut resist rust and corrosion

Technical Specifications

Applications

Municipal sewer line isolation, 8" storm drain testing, large-diameter DWV inspections, and internal pipe blocking during repair or replacement. Choose this over the End-of-Pipe model when you need the plug positioned inside the pipe, not at the opening. For pipe larger than 8", consider the Cherne T-Handle Gripper line.

Questions on sizing or bulk pricing? Call (866) 514-3684 or email us — same-day shipping on in-stock items, tax-exempt purchasing for qualified accounts.