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

Cherne Part Number	270-188
Nominal Pipe Size	4"
Usage Range	4.22–4.60"
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	9.7 oz
Pipe Compatibility	NPT threaded cleanout openings (cast iron, DWV)
Color	Black

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.

Cherne® 4" Tapón de Agarre® Clean-Out