How to Replace a Bathtub Spout Cutaway photos show how to replace the three . This area is prone to high moisture -- during shower use for example -- . 23 ต.ค. 2558 - Replace with a shorter nipple equal to the gap measurement. Use Teflon tape on all male pipe threads and caulking behind the spout base. Even the smallest gap between your bath spout and the wall or bathtub enclosure can lead to water dripping behind the wall and onto the subfloor when you use . If you've got a gap of 1/2 inch or less after you tighten the spout as far as it will go, the best way to erase it is to fill it with silicone caulk. Choose white caulk or one . How to Fix a Bathtub Spout The Does Not Sit Flush With the Fiberglass . Remove any silicone residue from the tub spout and wall area with a coarse sponge. . when the gap is too wide for silicone or you don't want to remove your tub spout. Bathtub Spout Issue discussion on the TexAgs Home Improvement forum. . The picture may not do it justice but it's too big of a gap to caulk. 27 มี.ค. 2554 - Should I use caulking or something on the gap between the spout base and . down into the ceiling of the room below so it seems like a big job.