0 item(s)
View cart
You have no items in your shopping cart.
$ 681.77
Availability:
Out Of Stock
Estimated delivery: June 9 – June 11
Estimated delivery: June 9 – June 11
Sku: 311088
The Cherne I-Series Muni-Ball 4"-8" with 3/4" Bypass (part #311-088) is a premium multi-size pneumatic bypass plug for 4" through 8" sewer pipe. The 3/4" bypass allows controlled flow during testing. Rated for 15 PSI at 45 PSI inflation. Premium natural rubber bonded to aluminum end plates. At 7.0 lbs, it covers the most common residential and light commercial sewer sizes with one plug.
Key Features
- I-Series premium construction — natural rubber bonded to aluminum end plates
- 3/4" 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 | 311-088 |
| Pipe Size Range | 4"-8" |
| Usage Range (Pipe ID) | 3.95–8.25" |
| Bypass Size | 3/4" |
| Max Back Pressure | 15 PSI |
| Inflation Pressure | 45 PSI |
| Body Material | Natural rubber, aluminum end plates |
| Deflated Length | ~23" |
| Weight | 7.0 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.
We ship UPS and the tracking number will be emailed.
As always, feel free to call 866-514-3684 or email sales@envirodesignproducts.com for any questions.
