Are these safe

[marinelife]

These say they are for drains, are they safe for tank use?

I am thinking about connecting my new sumps with these.

http://www.lowes.com/pd_23471-34146...RL=/pl__0__s?Ntt=flexible+coupling&facetInfo=

 

[tkeracer619]

If its not for potable water I would not use it.

Odds are its OK but IME its not worth risking unless you can absolutely confirm it.

 

[jacob.morgan78]

I used some of the similar material trying to quiet my skimmer and it really messed stuff up. Nothing visible or something I could test but my skimmer didn't work well for a long time after that (weeks). It definitely leached something into the water.... Didn't have many corals at the time so don't know if it would have affected them.

 

[scarface70706]

i use this on my skimmer and my skimmer works fine, corals are happy, fish are happy, and im happy lol. as far as i see its safe. im not too sure how your going to use it but if its going to be submerged under water i wouldnt use it due to the metal rings. in my system i use it on my skimmers spout but i removed the rings before hand since it will be in the water. good luck

 

[FlashJordan]

I used to have one of those clamps on the return pump, but the metal eventually rusted so I pulled it out. There's plastic clamps you can use that won't mess up the water, or in my case, a heavy duty rubber band!