Thats a great idea for the heater supply.
I may need to do something similar if I ever re-connect the heater.
Don't really need a heater here in Perth as it does not get that cold.
In regards to the check valve, the red check valve in the picture is an Earls item, this hose sucks from the Vacuum bottle, which in turn sucks from the brake booster which has another check valve.
In all I have three check valves in the brake system as I also have an electric vacuum pump sucking on the vacuum bottle via the third check valve.
regards,
Tony.
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