Don't mean to shanghai thread, but thanks for sharing the manifold idea. Never thought about it until you mentioned it. I usually just switch hoses. I looked at some on eBay and the price looks reasonable. Is yours something like this?
METER STAR Propane Manifold LP Tank Fuel Tee Gauge Adapter Fitting Propane Split 769891673396 | eBay
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The comments say: "DO NOT Worry if you just connect one grill on the adapter , it will be no gas leakage from other two." Don't know how they prevent an open fitting from leaking, but maybe with your experience you can enlighten us.
Are you serious ? The extra ports have an internal pin that needs to be compressed when you screw on another hose , ( just like any tank has an internal check valve )