The Cherne 8"-10" Multi-Size Underground Muni-Ball (part #265-078) is a pneumatic bypass plug covering 8" through 10" underground sewer and storm pipe. Rated for 17 PSI / 40 ft. head pressure. The 2" bypass provides high-flow capacity during testing on larger municipal mains. Natural rubber inflates to seal pipe from 7.00" to 10.25" ID. Multi-size coverage eliminates carrying multiple single-size plugs.

Key Features

Pneumatic inflation — natural rubber expands to seal round and out-of-round pipe
17 PSI / 40 ft. head pressure — rated for sewer air pressure testing
2" bypass — controlled flow-through during testing
Multi-size coverage — one plug replaces multiple single-size plugs
Natural rubber — durable construction for underground sewer environments

Technical Specifications

Cherne Part Number	265-078
Pipe Size Range	8"-10"
Usage Range (Pipe ID)	7.00–10.25"
Bypass Size	2"
Max Back Pressure	17 PSI / 40 ft.
Body Material	Natural rubber
Operating Temperature	0°F to 125°F
Pipe Compatibility	All underground sewer and storm pipe types

Applications

Municipal sewer air testing with controlled bypass flow, storm drain testing, underground pipe isolation during repairs, and construction acceptance testing. The multi-size design reduces the number of plugs field crews need to carry. Always follow Cherne inflation 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® 8-10" Multi-Size Underground Muni-Ball® Plug 2" Bypass