False alarm, I tried another store and found all kinds of ABS to
11/2"NPT adaptors, they had nylon 11/2"NPT to 11/2" hose barbs so the
problem is solved.

TB wrote:

Has any one found a good way to adapt 11/2" ABS to 11/2" rubber hose? I
have searched the building store and there are all kinds of adaptors in
PVC but not ABS . The O.D. of ABS is 17/8" . I looked at cementing 11/4"
ABS into the 11/2" to make a sleeve but the fit is to loose. There are
rubber adaptors available but these are very thin wall and allow only
one Hose clamp.
Tony