| When you talk about the use of ABS vs PVC schedule 40 in underground installations - keep this fact in mind as well - PVC is a solid material poly vinyl chloride, where as ABS is designed for drain,waste and vents (DWV) and is a foam core pipe. If you want to use ABS 6-8 feet underground, you could end up with a pipe that becomes misshapen over time due to weight of soil/compaction and it could even collapse (although this would be extreme, yet possible). When we build a pond, EVERYTHING THAT GOES UNDERGROUND IS PVC! ABS and PVC can be glued together with no problem, just make sure you use the correct glue, such as Christie's Red Hot Blue Glue. It's designed just for this purpose. I don't however recommend using ABS couplers. There just isn't enough "shoulder" to make a good long lasting and solid connection.
Mike |