I'm taking out an old, busted pool heater. Didn't work when we moved in, no plans to replace it in near future. I've attached a picture of the liquid propane line that has a ball valve and then a plug valve (?, turquoise colored part in pic) on top of that. Would you recommend capping the line on top of the plug valve with a black iron cap; or would you also remove the plug valve and put a brass plug in the bottom brass ball valve?
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