How about adding a Pollution depending on the fluid flushed down the drain?
something like 0 for clean water, 100 for dirty water 1000 for oil
(if you consider the idea, please add IR Support :) )

hello SunBlaze,
I really like the idea of giving the users the option to let the pipes drain energy or emit pollution. However, as far as I know this is not possible for pipes in general. I keep looking to maybe find another way around.

Hi, thanks for the Response^^
maybe it doesn't have to be a pipe-entity but any other type of small building (maybe 2x2)?

Im currently thinking about making it some kind I of 1x2 pump if enabled. If so got some time, I'll have a look