Cherne ® 12 in. Single-Size Underground Test-Ball ® Plug

The Cherne 12" Single-Size Underground Test-Ball (part #041-408) is a pneumatic blocking plug for 12" sanitary and storm sewer testing. Natural rubber inflates to seal 12" pipe (usage range 10.50"–12.25" ID). Rated for 17 PSI / 40 ft. head pressure at 25 PSI inflation. At 11.3 lbs and 13.75" long, this is a substantial plug for municipal sewer mains. 1/4" inflation thread, 3/8" eyebolt for poly-lift line.

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
• Full blockage — complete shutoff for sewer air tests and isolation
• 3/8" eyebolt — attach poly-lift line for manhole deployment and retrieval
• Natural rubber — durable construction for underground sewer environments

Technical Specifications

Applications

Municipal sewer air pressure testing, storm drain isolation, underground pipe blocking for repairs, and back-plug applications. Deploy through manholes using the eyebolt and poly-lift line. 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.