Propane distribution post valves leaking

You can get brass caps for each 1x20 threaded outlet.
https://www.amazon.com/Propane-Bottle-Coupler-Protect-Disposable/dp/B01JLGVMYQ

or get a new one that mounts to the protective collar

https://www.theoutdoorworld.com/century-tool/century-tool-propane-distribution-tree-30-in-3-outlets-35095?gclid=CjwKCAjw-6bWBRBiEiwA_K1ZDQopGfFDyXgJXoDCceS9LT6_ygB-LLzyCuHPxinZ-YsGy44MnNp3wxoCL5MQAvD_BwE

The Pressure on the valve is negligible. They have mounted Regulators to the tank valves for 50 years and in the past 38(my time and still as an RV tech), I have never seen a problem with any type mount. To answer your question, I have NEVER seen such a mount in 38 years. But, the basic rule(especially in Texas) on LP parts like yours is REPLACE as they rarely offer parts because of liability. You need to contac Century and see if they offer replacement parts. Doug

Century Tool & Manufacturing / Kay Home Products
90 McMillen Road
Antioch, Illinois 60002
Phone: 800-635-3831
Fax: 847-395-3305