These are brand new chrome plated brass banjo fitting so you can use a SPG on your double hose. You must have a long yoke to use the banjo fitting. If you are not sure what style of yoke you have email me some photos and I can tell you. I also have a limited number of long yokes for sale for both two and single stages. Please check the site for availability. This banjo is 3/8 threads to work with your vintage pressure gauge. If you want to use a modern gauge using 7/16 an additional adapter is needed.
Price $49.00 plus $3.00 shipping.