Cherne ® 4" Clean-Out Gripper ® Plug

The Cherne 4" Clean-Out Gripper (part #270-188) is a mechanical test plug for 4" NPT threaded cleanout openings — the most common cleanout size in residential and commercial plumbing. Guaranteed to seal most damaged threads. Rated for 17 PSI / 40 ft. head pressure. Fits 4" NPT cleanout fittings in cast iron and DWV pipe (usage range 4.22"–4.60"). Glass-reinforced ABS body with natural rubber threaded O-ring and stainless steel hardware. Wing nut installation — no tools required.

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

Technical Specifications

Applications

The workhorse cleanout plug for 4" DWV pressure testing, building inspections, code compliance tests, and permanent cleanout closure. The threaded O-ring seals damaged, worn, or cross-threaded NPT fittings — a common problem on 4" cast iron cleanouts in older buildings.

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.