Cherne ® I-Series Test-Ball ® Blocking Plug 12-24 in, 15 PSI

The Cherne I-Series Test-Ball 12"-24" (part #310-248) is a premium multi-size pneumatic blocking plug covering 12" through 24" sewer and storm pipe. Rated for 15 PSI at 45 PSI inflation. At 26.9 lbs and ~37" deflated, this is a major plug for large-bore municipal mains. Usage range 11.00"–24.25" ID. Premium natural rubber bonded to aluminum end plates with 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

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.