I cut a access hole in plastic, Yes I do have a fuel tank,I used a right angle drill with a hole saw bit on it drilled as close to opposite side of discharge outlet as I could ,ran a bead of sealant,install black tank flush,ran hose to underside of Rv so it was easy to hook up hose to flush,screwed plastic sheathing in place,taped joints,done. Note my back black tank also hold waste water from kitchen sink and 1/2 bath sink so it really doesn't get to dirty,I just like that I can really clean them good when I want too.
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