I find that little adapter thing to be very handy. You glue it onto the light housing and glue a slip coupler over that and you have converted to 1 ½” PVC. From there I usually use the flex PVC as I love the stuff. It darn near lasts forever and is much easier to use that rigid PVC. If you still want to use a standard pool hose just get a coupler that is slip on one side and threaded on the other. Insert a barbed hose adapter into the threaded side and your hose well never come off again.

Later, Dennis