All of the hose assemblies manufactured by M.B. Sturgis are certified assemblies to CSA 8.3-1 & UL569. The hose assemblies shown are our most popular selling hoses in the propane business. If there is a need for a different hose configuration or a different hose material, we will work with our customers to develop a custom hose to the specific request. We have high pressure Rubber, Thermo-Rubber and Thermo-Plastic hose to choose from depending on the application.