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Cherne® 8 in.- 12 in. Multi-Size Underground Test-Ball® Plug
Features
- Seals both round and out-of-round pipe
- Made of natural rubber for excellent expansion and memory
- Removable inflation valve can be replaced if damaged or replaced with quick disconnect fitting
- One plug fits multiple pipe diameters
- Use to block flow or as a back plug for sewer air testing
- Multi-Size Underground Test-Ball® Plug for 8 in - 12 in
Manufacturer Resources
Product Specs
- Chain Eye Bolts:
- 3/8 in. (1)
- Deflated Diameter:
- 6.75 in. (171 mm)
- Deflated Length:
- 16 in.
- Inflation Pressure:
- 20 psi (1,4 bar)
- Inflation Thread:
- 1/4 in. (1)
- Maximum Back Pressure:
- 11 psi (0,75 bar)/25 ft. (8 M)
- Volume:
- 0.49
- Department:
- Plumbing
- Product Group:
- Plumbing Testing
- Product Subgroup:
- Testing Products
- Product Type:
- Test Plug
- Product Finish:
- Black
- Product Weight:
- 7.15
- Product Nominal Size:
- 8 in. - 12 in. (200 - 300 mm)
OATEY 275088 – Frequently Asked Questions
1) What pipe sizes does the Cherne 275088 Test-Ball plug fit?
The Cherne 275088 Multi-Size Underground Test-Ball plug covers 8 in. through 12 in. (200 to 300 mm) nominal pipe, so one plug handles three or four common line sizes instead of carrying a separate ball for each. Deflated it measures 6.75 in. (171 mm) diameter by 16 in. long, which is what has to pass through the access opening before you inflate it.
2) How much air pressure do I put in the 275088 test ball, and how much head can it hold back?
Inflate to 20 psi (1,4 bar), no more. Once set, the 275088 holds a maximum back pressure of 11 psi (0,75 bar), which is 25 ft. (8 M) of water head. If your test column will be taller than 25 feet of water above the plug, this ball is not the right tool for that test.
3) Will a test ball seal a pipe that has gone out of round or has a rough interior?
Yes, that is the main reason to use an inflatable ball rather than a mechanical plug. The natural rubber body expands to the shape of the bore and seals both round and out-of-round pipe, and the rubber's memory pulls it back down for removal. Mechanical plugs with a fixed gasket depend on a true round bore, so on old clay, cast iron, or deformed plastic the ball is the safer choice.
4) Can I use the 275088 for a sewer air test, or only to block flow?
Both. It is rated for blocking flow during line work and for use as a back plug in sewer air testing. For an air test, the plug seals the downstream end while the test pressure is introduced upstream, and the 11 psi back pressure limit governs how much pressure the plug can take against it.
5) What fitting do I need on my air hose to inflate this Cherne plug?
The inflation valve is a single 1/4 in. thread connection, so a standard 1/4 in. air line or inflation hose mates with it. The valve is removable: if it gets damaged in a manhole you replace just the valve, and you can swap it for a quick disconnect fitting if you are inflating plugs all day.
6) Is there a way to tie a rope to this plug so it can be retrieved from a manhole?
There is one 3/8 in. chain eye bolt on the plug, which is where you attach a rope or chain for lowering and retrieval. On an 8 to 12 in. underground line that tether is what keeps the ball from being pushed downstream if it loses grip, so always rig it before inflating.
7) What is the exact Oatey part number for the 8 to 12 inch Cherne multi-size test ball?
Order Oatey part 275088, the Cherne Multi-Size Underground Test-Ball plug for 8 in. to 12 in. pipe. Black natural rubber body, one 3/8 in. eye bolt, 1/4 in. inflation thread. It is a single model with no size or finish options to specify.
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Does the OATEY 275088 come with a warranty?
Absolutely. The OATEY 275088 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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