I now have two hot tub jet wall fittings that have come loose. They are waterway wall fittings and look like they glue onto a 1 inch pvc pipe in the back. Can I just empty my hot tub and glue these back into place? Any type of special glue I should use? Here is a link to the type of fitting. http://www.poolpartsonline.com/p-24852-215-1070-wall-fitting-for-poly-gunite.aspx