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Cherne ® I-Series Test-Ball ® Blocking Plug 12-18 in, 15 PSI
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...
$ 1,178.45When You Need a Complete Seal
A blocking plug stops all flow. No bypass, no bleed-through — the pipe is sealed. That’s what pressure testing, smoke testing, and construction isolation require: a reliable seal you can trust while your crew works or your gauges are reading.
Every blocking plug we carry is Cherne — the pneumatic plug that plumbing contractors and municipal crews have relied on for decades. Inflate to spec, verify the seal, and get to work.
Test-Ball vs. I-Series
Test-Ball — Single-size plugs. Each one fits a specific pipe diameter. The simplest, most proven design. If you know your pipe size and only work in one or two diameters regularly, Test-Ball is the straightforward choice.
I-Series — Multi-size range plugs. A single I-Series plug covers a range of pipe diameters, so one plug handles multiple sizes. Fewer plugs on the truck, more flexibility on-site. Better for crews that encounter varying pipe sizes across different jobs.
Blocking Plug vs. Bypass Plug
Blocking plugs create a complete seal — use these for pressure testing, air testing, and situations where zero flow is required. Bypass plugs (Muni-Ball) seal the pipe but divert flow through a channel — use those for sewer repair work where you can’t fully stop flow.
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FAQ
What pressure can Test-Ball plugs handle?
Pressure ratings vary by size. Most single-size Test-Ball plugs are rated for testing pressures up to the specified PSI listed on each product page. Always verify the rating matches your test requirements before inflating.
Should I use a blocking plug or a bypass plug?
Blocking if you need zero flow (pressure testing, smoke testing, construction isolation). Bypass if flow can’t be fully stopped (active sewer repair). Never use a blocking plug in an active sewer line without upstream diversion.
