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Estimated delivery: June 9 – June 11
The Cherne I-Series Muni-Ball 12"-18" with 3" Bypass (part #214-188) is a premium multi-size pneumatic bypass plug for 12" through 18" sewer pipe. The 3" bypass provides maximum flow-through for large-diameter trunk main testing. Rated for 15 PSI at 45 PSI inflation. Premium natural rubber bonded to aluminum end plates with 3/4" eyebolts and field-replaceable pressure relief valve.
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 | 214-188 |
| Pipe Size Range | 12"-18" |
| Bypass Size | 3" |
| Max Back Pressure | 15 PSI |
| Inflation Pressure | 45 PSI |
| Body Material | Natural rubber, aluminum end plates |
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.


