What to use to attach pvc to exertnal pump???

[Reefing Madness]

Your too much dude.


But I'm not impressed

You should be. I've learned through the years not to over tighten things. Some people don't ever pick it up.

 

[mfinn]

Actually I'm not impressed at all.
I would have respect the person to be impressed by them.
Judging by your wise crack answers and replies respect is something you won't get from me.

 

[Spinner]

9,272 post in 540 days when do you find time for the gym to work on your bench

I use a pipe joint/gasket seal myself but to each his/her own.

 

[mike007]

I've been a plumber for about 15 years and can tell you that pipe threads do indeed need either Teflon tape or rector seal to keep them from leaking. On my tanks I've never used anything but Teflon tape and in some cases with cheap molded plastics can split with only a few too many wraps of tape on them. I typically wrap about five or six times but with some pumps ten wraps feels like a more snug fit. Mag drives tend to seem more secure with ten wraps but I have split a mag drive pump by threading it to tight with the extra Teflon tape.

Ten wraps is far from a whole roll of tape

Copper, galvanized, black pipe, CPVC and PVC threads will all leak without some sort of sealant. The fittings can also all split if you over tighten them

Amen bro I have been a master plumber for 35years and Teflon tape is what I recommend for reef tanks period. Most pipe dopes contain petroleum additives which could possibly leach into tank. Teflon tape will not cause fittings to crack only over tightening or a bad fitting.