The Cherne I-Series Muni-Ball 6"-12" with 1" Bypass (part #311-128) is a premium multi-size pneumatic bypass plug for 6" through 12" sewer pipe. The 1" bypass provides controlled flow during testing. Rated for 15 PSI at 45 PSI inflation. At 11.0 lbs and ~25" deflated, it covers the full range of standard municipal sewer mains. Premium natural rubber with aluminum end plates and full body cording.

Key Features

I-Series premium construction — natural rubber bonded to aluminum end plates
1" bypass — controlled flow-through during testing
15 PSI rated — for sewer air pressure testing
Pneumatic inflation — natural rubber seals round and out-of-round pipe

Technical Specifications

Cherne Part Number	311-128
Pipe Size Range	6"-12"
Usage Range (Pipe ID)	5.50–12.25"
Bypass Size	1"
Max Back Pressure	15 PSI
Inflation Pressure	45 PSI
Body Material	Natural rubber, aluminum end plates
Deflated Length	~25"
Weight	11.0 lbs

Applications

Municipal sewer air pressure testing, storm drain isolation, large-diameter pipe testing during construction and repair, and compliance testing on trunk mains. 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® I-Series Muni-Ball® Plug 6-12 in w/ 1 de derivación