If H2O is on the inside of a fire hydrant, what's on the outside?!

Question: If H2O is on the inside of a fire hydrant, what's on the outside!?
Answers:

K9PWww@Enter-QA@Com

dog pee !.!.!.!?!?!?Www@Enter-QA@Com

Co2Www@Enter-QA@Com

A dog peeing on it!.Www@Enter-QA@Com

o for oxygenWww@Enter-QA@Com

O!?Www@Enter-QA@Com

the cover of the hydrant!?
dog pee!?
paint!?Www@Enter-QA@Com

ADP
(a dog peeing)Www@Enter-QA@Com

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