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justin79 · Aug 18, 2012, 04:01 AM

My drain pipe for my washing machine is metal. The p-trap was clogged and causing it to over flow. When I tried to take the stand pipe off it snapped the p-trap.Can I use a plastic fitting to screw onto old pipe and put in a plastic standpipe and p-trap?

massplumber2008 · Aug 18, 2012, 06:00 AM

Hi Justin...

Sure can.

I would recommend that you install a threaded plastic adapter and then a cleanout tee fitting and then the PTRAP and standpipe... ;)

Good luck!

Mark

justin79 · Aug 18, 2012, 06:54 AM

Thanks I'll try drain pipe is behind a wall and lower than the floor and I can't access it from underneath the house . I barley had enough room to get what was left of the old p-trap off the drain pipe. It took a couple hours!

speedball1 · Aug 18, 2012, 07:03 AM

Now you got me curious.

.Can I use a plastic fitting to screw onto old pipe

What "old pipe"? What material is it made of? Does it have threads so you can screw in a threaded plastic adapter as Mark suggested? Let me know Tom

justin79 · Aug 18, 2012, 07:27 AM

Originally Posted by speedball1

Now ya got me curious. What "old pipe"? What material is it made of? Does it have threads so you can screw in a threaded plastic adapter as Mark suggested? Let me know Tom

The old stand pipe and drain pipe. I'm guessing it's galvanized or what ever they used to use. Maybe iron? I don't know, it's fairly brittle. Yes the pipe is threaded but, and don't laugh, like I said there is no room to work where it is located, I had to drill holes where the old p-trap screwd on to drain pipe so I could use a long screwdriver and hammer to tap it around to unscrew it, and some of the holes went through the threade part of the drain pipe. They're not big so I'm thinking if I use teflon tape it will be OK. Am I right?

speedball1 · Aug 18, 2012, 08:40 AM

The old stand pipe and drain pipe. I'm guessing it's galvanized or what ever they used to use. Maybe iron? I don't know,

Not good enough! Too many mabies and I don't know in your answer. Galvanized is silver, cast iron is black and I assume you recognize plastic.

had to drill holes where the old p-trap screwd on to drain pipe so I could use a long screwdriver and hammer to tap it around to unscrew it,

Before we take this any farther I have to know what material your pipes are made of. Sounds like cast iron.. Are the black and rough to the touch? Back to you, Tomk

justin79 · Aug 18, 2012, 08:56 AM

Originally Posted by speedball1

Not good enough!! Too many mabies and I don't know in your answer. Galvanized is silver, cast iron is black and I assume you recognize plastic.
Before we take this any farther I have to know what material your pipes are made of. Sounds like cast iron.. Are the black and rough to the touch? Back to you, Tomk

Then it's galvanised. It was silver and I thought I could smell it when I was drilling it.

Originally Posted by justin79

Then it's galvanised. It was silver and I thought I could smell it when I was drilling it.

I went and looked at it again to make sure the stand pipe and drain pipe are silver but the p-trap was black.

speedball1 · Aug 18, 2012, 09:21 AM

Thanks Justin.
I now have a pretty good idea of what your set up is. Did you harm the cast iron "P" trap when you drilled into it ? Can it still be used? Are the trap threads so they can be used?

Thanks I'll try drain pipe is behind a wall and lower than the floor

If the trap's usable you shouldn't have to mess with the drain pipe. I assume you've already opened up the wall so you can follow the advice giver by Mark. Back to you. Tom

justin79 · Aug 18, 2012, 09:46 AM

Originally Posted by speedball1

Thanks Justin.
I now have a pretty good idea of what your set up is. Did you harm the cast iron "P" trap when you drilled into it ? Can it still be used? Are the trap threads so they can be used?
If the trap's usable you shouldn't have to mess with the drain pipe. I assume you've already opened up the wall so you can follow the advice giver by Mark. Back to you. Tom

Yes it busted when I tried to unscrew the standpipe. I opened the wall but the drain pipe is lower than the subfloor so I have very little room to work in. My laundry room is an add on and they didn't leave an access to get under that part of the house.Thats why I wanted to use plastic if I could.

speedball1 · Aug 18, 2012, 11:16 AM

the drain pipe is lower than the subfloor so I have very little room

Do you have enough room for a metal shielded coupling? (see image) If so then transition to PVC and bring drain pipe up to where you can glue on a sanitary tee, From there you can prime and glue a PVC Trap, a 36" stand pipe and connect the vent. Good luck, Tom