rotten rubber fernco what could cause this?

[jacob...]

hello, i own a rental property and my tenant told me there was a leak under his tub. when i crawled in the crawl space a fernco fitting had completly disappeared. the two metal ring clamps on each side and the rubber beneath those clamps was all that was left. all the rubber that was supposed to connect the abs to the cast pipe was gone. ive never seen this and i am just wondering what could cause this? is it acid in the pipe? rodents? or is this something that can happen with time? any input would be appreciated.

thanks

 

[Twowaxhack]

My money is on rodents.

 

[breplum]

Many confirmed disasters I've observed from rodent consumption of rubber "Jim" caps sometimes called cleanout caps.

 

[sawguy]

Mice and rats love rubber. Chewed through the spark plug wires on my truck.

 

[arctic bill]

i am now hearing about mice and rats chewing through plastic water pipe like pex .

 

[kiwi_outdoors]

and over in the hamlet of Mineral, CA, the Marmots chew through radiator hoses.