When we removed the OEM black tank this is what we found. The skillful and meticulous installers of the original black tank made this modification to the bottom aluminum panel under the shower as the shower drain trap apparently wouldn\'t go in properly. So since 1977 this adaptation was pressed between the black tank and the bottom of the coach. We don\'t think it was a way for mice to get in but we cut it out completely and made our own cover for the trap.
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