Pure exhaust (2.5% carbon monoxide, CO) is captured off a gas engine that drives a compressor, cooled, pressurized, and injected into the burrow of a burrowing rodent.  The air in the burrow is purged very rapidly.  The rodent is engulfed almost immediately in a high concentration of CO gas and overcome before it has a chance to escape or block the burrow.

A T-bar hand piece with a ball valve is on the end of each 3/8" air hose.  Closed burrows are probed.  When the tip of the probe breaks into the burrow, it literally falls into the burrow and is very easy to detect or feel.

 gopher mound probing schematic

To treat open burrow rodents, such as ground squirrels, prairie dogs and ground hogs, the probe or the 3/8” short air hose (furnished with the machine and replaces the ¼” probe on the end of the T bar hand piece) is inserted into the open burrow.  Dirt is then shoveled to close the opening and direct the gas flow down into the burrow.

The ¼" probe is used when treating voles and field mice and the opening is not closed except by stepping on the opening after the probe has been placed.

IMPORTANT!  Treat all live holes.  It is impossible to tell if one mound or hole is connected to a nearby mound or hole.  If gas is coming out of the adjacent hole, then it is obvious that they are connected and the adjacent hole should be plugged and need not be treated.

gopher-blog-illustration

NOTE: If the probe is not in the burrow after insertion, the pressurized gas will blow back up the hole made by inserting the probe.  This can and usually will result in sand and dirt being blown into the face of the operator.  For this reason, it is strongly recommended that the operator wear eye protection.  Remember, the gas is under pressure!