I received my heater valve from Plane Innovations. It’s basically a stainless steel version of the aluminum valve that Van’s sells. In case of a fire, the aluminum version would melt in a matter of seconds. This would keep the fire contained for long enough that I could likely get on the ground.
I also received a half pint of firewall sealant from SealPak. This is the same CS1900 sealant that Van’s sells, but not in a single use container. Since the firewall will be sealed over several sessions, this will ultimately save me a fair amount of money.