The Cherne 4" Muni-Ball Plug (part #262-048) is a pneumatic bypass plug for 4" sewer and drain pipe — the most common residential sewer line size. The 3/4" tank valve bypass allows controlled flow during DWV testing. Rated for 22 PSI / 50 ft. head pressure at 40 PSI inflation. Natural rubber inflates to seal pipes from 3.25" to 4.25" ID.

Key Features

3/4" tank valve bypass — controlled flow-through during sewer and drain testing
22 PSI / 50 ft. head pressure — rated for sewer air and DWV testing
Pneumatic inflation at 40 PSI — natural rubber seals round and out-of-round pipe
Tether-bar compatible — holds to full head pressure with tether bar
Natural rubber — durable construction for sewer environments

Technical Specifications

Cherne Part Number	262-048
Nominal Pipe Size	4"
Usage Range (Pipe ID)	3.25–4.25"
Bypass Size	3/4" tank valve
Max Back Pressure	22 PSI / 50 ft.
Inflation Pressure	40 PSI
Body Material	Natural rubber
Deflated Length	8.0"
Deflated Diameter	3.13"
Operating Temperature	0°F to 125°F

Applications

Sewer air pressure testing with controlled bypass flow, DWV code compliance testing, municipal sewer main isolation, storm drain testing, and pipe repair work requiring temporary flow control. The bypass allows water to pass through the plug during testing rather than building up behind it. Always follow Cherne inflation and back-pressure guidelines.

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" Muni Ball Plug, 3/4" Bypass