Danicorp Rubber Low Pressure Hoses with 1/2 first stage fitting. NOT STANDARD THREADS
Please note this is a regulator hose and not a BCD hose. Also note that the 1/2 first stage fitting is NOT a standard fitting. Just to name a few but Dacor and Apeks have had generations of these port sizes. BUT if you like the price, you can add an adapter to make them work.