The Cherne I-Series Muni-Ball 8"-16" with 2" Bypass (part #312-168) is a premium multi-size pneumatic bypass plug covering 8" through 16" sewer and storm pipe. The 2" bypass handles high flow volumes on large mains. Rated for 15 PSI at 45 PSI inflation. At 18.0 lbs and 28" deflated, it’s the workhorse of municipal sewer testing. Usage range 7.50"–16.25" ID.

Key Features

• I-Series premium construction — natural rubber bonded to aluminum end plates
• 2" 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

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.