I know this is an old post but given that the part in the picture looks like schedule 80 pvc i thought i'd give some advice to those that come across this page.
based on the picture i'd say the pipe is 3/4" and the split pipe is behind the 90 degree elbow.
You could make a fitting by buying a schedule 80 1-inch pipe piece, along with (2) 1-1/2-inch hose clamps, some pvc primer and some christy's pvc cement
Split the pipe piece you just bought in half to make a piece that will slip over a pipe.
you now have two fittings.
now assuming the water is shut off properly.
apply primer to the pipe and the fitting, then unscrew the hose clamps until they open.
Apply the pvc cement to both the pipe and one of the fittings, then join the fitting at the crack in the pipe and slip both hose clamps over the fitting and pipe and tighten it down.
then wait until it cures.
If done properly, you have just fixed the leak.
important note: make sure to tell them you want medium set pvc cement.
heres two references:
Here's an alternative if you want to ensure a good fit without the need for adjustable hose clamps.