How to Guide
FAQs
Q What is the difference between a Test Ball and a Muni Ball?
A Test Ball and Muni Ball are trademarked names. A test ball does not have a bypass and it is designed
to do one job, blocking (sealing) a pipe. A Muni Ball has a bypass tube that runs through the plug that
allows the user to bypass efuent through the tube, or with an adapter cap, it can be converted to
complete an air test. Muni Balls can also be used for blocking pipe as well.
Q What is the shelf life for Cherne pneumatic plugs?
A Cherne offers a 2 year warranty on all pneumatic plugs from date of manufacture, (plugs are post-dated
by six months to allow for shelf time). If kept in controlled conditions (not exposed to sunlight and kept
at temperatures between 0-125 degrees F) the pneumatic plugs remain in good condition for a longer
period of time. Plugs should always be inspected for visual damage prior to every use.
Q How do I read the date code on Cherne test balls and plugs?
A Date codes on small test balls/long balls are two digit numbers (ex. 14). Date codes are changed each
year on July 1st. Plugs manufactured on/after July 1st will bear the last two digits of the next year (ex.
Plug manufactured on July 1st, 2014 would have a date code of 15). Larger plugs have the date codes
stamped on the front of the plug. It will begin with the year, followed by a letter indicating the month,
followed by a number for the day, and a letter for the unit produced. Example for a plug manufactured on
February 14th, 2015 would read 15B14A.
Q What is the difference between a Long Ball and a MS-2 Long Ball?
A Both our original long ball and our MS2 Long Balls are designed to seal wye ttings while conducting a sewer
test. The MS2 Long Ball is unique as it features a relief valve, is multi-size, and inates and deates in stages to
keep the work area dry by keeping the water from coming up through the pipe riser during the deation process.
Q What type of rubber is a Cherne pneumatic plugs made from?
A All of Cherne’s pneumatic pipe plugs are made from natural rubber. The only exception is our yellow
pillow plugs which are made from a polyurethane impregnated fabric.
Pneumatic Test Balls