Kevin K Stevens Point , WI October 23, 2015 Appliance: Whirlpool Undercounter Dishwasher GU940SCGB2 Whirlpool Dishwasher Gu940scgb2: The water supply hose to the upper rack sprayer had holes in it. How to replace Manifold Tube. I found the replacement part on the website and ordered it. I took the old hose off and installed the new part with no difficulty. The new part was a little different (new design ?). Seemed to be better than the original part. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes