You can actually shrink PVC down by heating it in an oven until its soft, I think 200 F would do it, then GENTLY tighten a hose clamp around it while its in place. Remove the hose clamp after it cools, and if you didn't tighten the hose clamp too much it will be a tight slide fit.

I only need to extend the outlet 1-2 inches..

I will try Robs trick with the oven... now to figure out how to use an oven :)
Maybe the bbq will work

Do not expose it to direct flame, you will not get the desired result.

At Lordco Auto they had a variety of different o-rings in both diameter and thickness. I found something that I think will work. Won't know until I put 1000gph through the WS outlet.

Thanks for the help