The Cherne I-Series Test-Ball 8"-12" (part #210-128) is a premium multi-size pneumatic blocking plug for 8" through 12" sewer pipe. Rated for 15 PSI at 45 PSI inflation. Premium natural rubber bonded to aluminum end plates. A focused size range for crews primarily working on 8" to 12" municipal mains. 3/4" eyebolts for poly-lift line attachment.

Key Features

I-Series premium construction — natural rubber bonded to aluminum end plates with full body cording
Multi-size coverage — one plug covers multiple pipe diameters
15 PSI / 35 ft. head — rated for sewer air pressure testing
Full blockage — complete shutoff, no bypass
3/4" eyebolts + field-replaceable pressure relief valve (larger sizes)

Technical Specifications

Cherne Part Number	210-128
Pipe Size Range	8"-12"
Bypass	None (full blockage)
Max Back Pressure	15 PSI / 35 ft.
Inflation Pressure	45 PSI
Body Material	Premium natural rubber, aluminum end plates
Operating Temperature	0°F to 125°F

Applications

Municipal sewer air pressure testing, storm drain isolation, large-diameter pipe blocking during construction and repair, and compliance testing on trunk mains. Deploy through manholes using eyebolts and poly-lift line. Always follow Cherne inflation and back-pressure guidelines — never exceed rated pressures.

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 ® I-Series Test-Ball ® Blocking Plug 8-12 in, 15 PSI