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Simple Y-valve on the tank drain. One path to gravity drain, one to tank pump out sucker. Empties the entire tank and hose.

Polyethylene is a good choice. Ronco has been around a very long time and have a myriad of sizes and can do custom. https://ronco-plastics.com I didn't have space for it but did seriously consider this one for a gravity drain setup by Vetus.