What gunk do I used to connect PVC to galvanized pipe?

Question

I have matching threaded PVC and galvanized, all new. Should I use white 'joint compound with teflon" which you would use to connect galvanized to galvanized, or should I used purple primer for PVC + PVC cement, or something else, or both?

Answer 1

i usually use glue, and a lot of it on the threads. i always use a male PVC adapter going into female galvanized pipe. if you use a female PVC adapter going over male galvanized pipe the stupid things split after a few years.

one more bit of advice, dont "bottom out" the male PVC adapter into the female galvanized pipe fitting. leave about 1/16". if you bottom it out, it will break off every time.

Possum

Answer 2

My vision is, By replacing the galvanized pipe with a new piece of the same, would be a lot less time and cost. By the time you get a compression fittings for the galvanized and PVC fitting with a new piece of PVC pipe, trying to fit properly, with no leaks, would be extremely less cost, time, and energy. Two pipe wrenches, (may be borrowed from a friend or relative) a piece of same length pipe from a hardware store, a few dollars, that is already threaded. you'll need a small tube of pipe gunk,put to gather tightly and you should be good to go. Good luck.

Answer 3

Do not use primer! it will make the PVC soft and week.
read the directions on the joint compound some should not be used on plastics.
I would use 4 layers of of teflon tape.
If the joint compound is ok for plastic put a little on over the tape not under.

the primer is for glueing PVC only

Answer 4

if you have both male threads, then you need a glv. coupling & use the white dope. but the teflon paste is fine for most applications

Answer 5

use a threaded coupling with Teflon tape

Answer 6

simple,use threaded fittings gluing them together,especially when you use hot water,using cpvc,yellow in color,called transition unions.depot and Lowe's have plenty,and be sure to use cleaner primer and the correct glue.