The Cherne I-Series Muni-Ball 12"-24" with 3" Bypass (part #312-248) is the largest standard I-Series bypass plug — a 37.0 lb premium pneumatic plug covering 12" through 24" sewer and storm pipe. The 3" bypass handles full flow on trunk mains during testing. Rated for 15 PSI at 45 PSI inflation. Usage range 11.00"–24.25" ID. Premium natural rubber bonded to aluminum end plates.

Key Features

I-Series premium construction — natural rubber bonded to aluminum end plates
3" 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	312-248
Pipe Size Range	12"-24"
Usage Range (Pipe ID)	11.00–24.25"
Bypass Size	3"
Max Back Pressure	15 PSI
Inflation Pressure	45 PSI
Body Material	Natural rubber, aluminum end plates
Deflated Length	~37"
Weight	37.0 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 ® Enchufe 12-24 in c/ 3 de derivación