It sounds like your handle broke "inside the coroplast" at the slide valve body. If that's the situation, then you can cut a "3 sided square" access (leave the front edge as a "hinge") fold that down and access the area where the valve is located. Depending on what broke, you may be able to repair it without replacement or you might find that you have to remove the valve body and replace the entire assembly. With a full tank, it's not a pleasant task, with an empty tank it's not quite as "traumatic" but you'll still want to shower when you're finished. Once you know it's working properly, you can clean the coroplast with alcohol and seal the three edges with Gorilla Tape.
As an alternative, depending on the location of the valve, you may be able to remove the screws from a portion of the coroplast and access the valve. That said, you'll probably find it easier to have a "drip pathway" that doesn't pool on the coroplast, so cutting a hole is probably "preferred" for black tank valve repairs.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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