You're probably right about the 1 1/2" drain size.
Washer drains are 2", but you *might* get away with it.
Remove the existing 1 1/4" P-Trap and stub out a
1 1/2" PVC trap from the San TEE in the wall.
From the trap inlet side run a 1 1/2" PVC standpipe about 36"
off floor. If the washer hose is too big to fit, put
a 2" X 1 1/2" coupling on.
If you have room for a utility tub, drain the washer into that.
If there will be an inspection (now or later)...
The plumbing code calls for a 2 inch trap and a 2x1.5x2 sanitary tee.
The trap arm must be at least 2 diameters (that is 4 inches) in length.
The trap arm should be 6 to 18 inches above the floor and the stand pipe
should be 18 to 30 inches above the trap.
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