Try this:

http://tinyurl.com/ey877

Drain or supply? The drain should be 1 1/2" PVC. The supply should be 1/2" copper, CPVC or PEX. If it is CPVC or PEX, you may be able to find a marking to confirm this.

The tube says not to apply it if the temp is below 10 or over 100, so I don't think temp is a big issue. I don't recall the fumes being too bad, but I was using it on a basement foundation, not in an enclosed crawlspace.

I have several of the Watts brand fittings in place for over 3 years without any problems. They are incredibly easy to use.

There is a product similar to liquid nails called PL300 Foamboard Adhesive. I used it for just this purpose and it has worked well. Should be able to find it at a local home improvement store.

Thanks for the input. I'll try the p-trap.

I've been lurking for a while and found a lot of useful infomation, but have a question now. I have an early 70's Northern Star 10x50. This is a pre-HUD home and has no insulation beneath (This is a seasonal home, and insulating it is not really a problem I want to tackle). It has flexible copper tu...