The Cherne I-Series Test-Ball 12"-18" (part #210-188) is a premium multi-size pneumatic blocking plug for 12" through 18" sewer pipe. Rated for 15 PSI at 45 PSI inflation. Premium natural rubber bonded to aluminum end plates with full body cording. Built for large-diameter municipal trunk mains. 3/4" eyebolts and field-replaceable pressure relief valve.

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	210-188
Pipe Size Range	12"-18"
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 12-18 in, 15 PSI