The Cherne 3" Clean-Out Gripper (part #270-178) is a mechanical test plug for 3" NPT threaded cleanout openings — guaranteed to seal most damaged threads. Rated for 17 PSI / 40 ft. head pressure. Fits 3" NPT cleanout fittings in cast iron and DWV pipe (usage range 3.23"–3.50"). The 2.2" long, 3.5 oz plug installs without tools using the wing nut. Glass-reinforced ABS body with natural rubber threaded O-ring and stainless steel hardware — corrosion-resistant for long-term installations.

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

Cherne Part Number	270-178
Nominal Pipe Size	3"
Usage Range	3.23–3.50"
Max Back Pressure	17 PSI
Max Head Pressure	40 ft.
Body Material	Glass-reinforced ABS plastic
Seal	Natural rubber threaded O-ring
Hardware	Stainless steel
Operating Temperature	0°F to 125°F
Length	2.2"
Weight	3.5 oz
Pipe Compatibility	NPT threaded cleanout openings (cast iron, DWV)
Color	Black

Applications

Sealing 3" cleanout openings for DWV pressure testing, code compliance inspections, and permanent cleanout closure. The threaded O-ring design grips worn or cross-threaded NPT fittings that standard cleanout plugs leak on.

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 3" Tapón de Agarre® Clean-Out, 17 PSI