I am Bill Noble of Southwest Oklahoma City, owner of Rooter Man Plumbing and have been a plumber for 36 years.  I have seen a lot of squirrels caught in toilet vents.  They crawl in and get stuck and drown and stop up toilets.  On one occasion I got on the roof to unstop the vent.  The lady of the house was on the roof watching me and when I ran a snake in the vent and pulled out a squirrel, she fell off the roof and landed in her swimming pool.  As soon as fall comes, mating season begins for the squirrels.  The female runs down the vent with three or four males chasing her.  They all get stuck in the vents.  Some even end up underneath the stool and try to come up inside the stool.  When the vents are stopped up, the toilets won't flush.  When people pour liquid plumber into the pipes, squirrels inside lose their hair and look like naked babies when they are pulled out.  Leaves, tree limbs, twigs, and other debris also fall down the vent.  A small amount of accumulation tends to stop up the pipes.  The E-cap would help keep these articles out.  It would work well on the PVC vent pipes.  Almost every winter I get squirrels out of the lines.  Sometimes squirrels even get into the sewer line, can't turn around, and therefore, stop up the sewer line.  An air vent, such as the E-cap would work well on any of the vent pipes.  Before the E-cap was developed, the only advice I had to keep squirrels and other debris out of the pipes was to recommend covering the tops of the pipes with screen wiring.  It's great to know of a product that really works and fits PVC pipes.

Bill Noble
Rooter Man
405-409-8493 or www.rooterman.com