[paladin_k2]

Just as an added note, the transition from ABS to PVC can be tricky and unreliable if not assembled properly.

In larger pipe sizes, such as found in 4" bottom drain outlets, the recommended approach seems to be to use a rubber coupling with external stainless steel pipe clamps that fit snuggly to both the ABS of the bottom drain and the PVC of the outflow pipe. The rubber boot provides the watertight seal and then when it is nested in a concrete footing everything is sturdy enough to meet the 30+ year durability test.

Here is a picture of a W. Lim bottom drain bowl all connected up and just prior to setting the concrete support collar and footings of the final pond construction. Note the Stainless clamp bands on the rubber coupling: