I have a 2" ABS drain line for this tub. It is coming out of a concrete slab. Drain for tub is 1 1/2". Been looking all over internet to find a 2 inch to 1 1/2 slip joint adapter but haven't been able to locate one. Anyone know where I can find one. Thanks. This is my first post but you guys have been a big help in me plumbing my new house.