Bent gray tank valve pull, leaving town and freeze expected

[kamokomanche423]

Bent my valve pull emptying tanks today, gray tank 2is stuck open. Supposed to be leaving town tomorrow for 8 days with temps hitting freezing temps 4 of those nights..I have a secondary valve at the drain point that I can still keep closed and was thinking just dump some rv antifreeze in both gray tanks and might not have any issues? Or do I need to postpone my trip a day or 2 and get the valve pull fixed to close my gray tank and can keep tank heater on before I go?

 

[AbdRahim]

If the valve is in a basement compartment and it is only freezing at night, the antifreeze and tank heaters should be ok. Don’t know your rig, so I don’t know how well insulated it is. Is the compartment with the valves heated by the furnace? That would be an added help.