Cherne® 3-1/2" Clean-Out Gripper® Plug

The Cherne 3-1/2" Clean-Out Gripper (part #270-138) fills a gap in NPT cleanout sizing that most plug manufacturers skip. Rated for 17 PSI / 40 ft. head pressure. Fits 3-1/2" NPT cleanout fittings (usage range 3.75"–4.25") — a hard-to-find size common in older cast iron buildings. Glass-reinforced ABS body with natural rubber threaded O-ring and stainless steel hardware. At 7.5 oz it’s a carry-anywhere field tool.

Key Features

• NPT-threaded design — guaranteed to seal most damaged cleanout threads
• Stainless steel hardware — corrosion-resistant for permanent installations
• 17 PSI / 40 ft. head pressure — rated for DWV testing
• Mechanical wing nut expansion — no inflation, no tools required
• Natural rubber O-ring — reliable seal on round and out-of-round surfaces

Applications

The 3-1/2" NPT cleanout is common in older buildings and commercial cast iron plumbing but hard to find plugs for. This Clean-Out Gripper seals worn or damaged 3-1/2" threads for DWV testing, inspections, and permanent closure — no need to replace the entire fitting.

Questions on sizing or bulk pricing? Call (866) 514-3684 or email us — we ship within the USA and welcome tax-exempt purchasing for qualified accounts.