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

Cherne Part Number	270-288
Nominal Pipe Size	8"
Usage Range (Pipe ID)	7.70–8.03"
Max Back Pressure	17 PSI
Max Head Pressure	40 ft.
Body Material	Glass-reinforced ABS plastic
Seal	Natural rubber O-ring
Hardware	Zinc-plated carriage bolt, extra-large zinc wing nut
Operating Temperature	0°F to 125°F
Length	3-3/4"
Weight	2.60 lbs
Pipe Compatibility	Schedule 40 & 80 PVC, ABS, cast iron (no-hub, service weight, extra-heavy)

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.

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