One of our TC friends had his shower pan break loose in a glue joint.
We bought a rubber "p" trap... it allows the large owner to use the shower with the pan flexing slightly and no more strain.
We bought it at Lowes.
Lowes also has: ProPlumber Rubber Coupling (that can be shortened)
Price $8.98
click here... first product ProPlumber Rubber Coupling Item #: 144907 Model #: PPWSBA Connects sump pump discharge pipes where large gap exists
1-1/4" or 1-1/2" connections
Easily fixes mistakes in cutting pipes
better than experimenting with glue.
Sleepy