Try here....These are for Vent-stacks.
...................Vent-stacks create a path for air release to allow
your drains to work properly,and toilet to flush easily.
.
.>>>>>>
Roof Vent Boot Guard
Not only will squirrels eat thru the lead boot.......
......birds will also sit on edge of the roof vent for your toilet....
( on cold days) and get gassed by the fumes emitted.
If you are lucky they will die and fall off onto your roof.
...if you are UN-lucky the bird will fall INTO the vent stack
and plug it up with carcass.....this will keep your toilet and sinks
from draining properly...and ..be costly to remove the carcass.
If you have trees OVERhanging your roof ( especially palm trees)
snakes and mice and the rats without the fuzzy tail can enter your
home thru the vent and INTO your toilet.
Heck, I have seen squirrels IN toilets INside homes.
The MORAL of the STORY....
........>>>>>........GET RID OF BIRDFEEDERS.........<<<<<........
...birds spill the seeds....
.......mice/rats and squirrels eat the seeds off the ground.......
............Snakes show up to eat the mice etc....
.................Preadator Hawks and Eagles show up to eats the Snakes.....
.....................the preadator Birds spot snack size neighbor Dog.......
...............................and on goes the cycle of nature.
Here is an IDEA.....Get rid of the Birdfeeders.