The Cherne 18" T-Handle Gripper with Bypass (part #272-998) is the largest mechanical T-Handle Gripper in the Cherne line — a 30 lb heavy-duty aluminum plug with 3/4" NPT male bypass for 18" concrete and clay sewer pipe. Rated for 8.7 PSI / 20 ft. head pressure. Fits 18" concrete and clay pipe (usage range 17.7"–18.3" ID). The neoprene O-ring and zinc-plated steel T-handle are built for the demanding conditions of large-bore underground pipe testing.

Key Features

T-handle mechanical expansion — high-torque sealing for concrete, clay, and SDR pipe
3/4" NPT M threaded bypass — controlled flow during testing without full shutoff
8.7 PSI / 20 ft. head pressure — rated for sewer air pressure tests
Chemical-resistant neoprene O-ring — handles sewer gas and chemical exposure
Heavy-duty aluminum body — corrosion-resistant and lighter than cast iron

Technical Specifications

Cherne Part Number	272-998
Nominal Pipe Size	18"
Usage Range (Pipe ID)	17.7–18.3"
Bypass Size	3/4" NPT M
Max Back Pressure	8.7 PSI
Max Head Pressure	20 ft.
Body Material	Heavy-duty aluminum
Seal	Chemical-resistant neoprene O-ring
Handle	Zinc-plated steel T-handle
Body Length	9.7"
Weight	30 lbs
Pipe Compatibility	Concrete, clay

Applications

Municipal sewer testing on 18" concrete and clay trunk lines, interceptor isolation, large-diameter storm sewer testing, and construction acceptance tests. At 30 lbs, plan for two-person handling. For larger pipe or higher pressure requirements, transition to the Cherne I-Series pneumatic plug 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® 18" Gripper® Plug 3/4" con Bypass