These female adaptors come in both Stainless Steel and Brass materials and are for connecting your male thread to our Ralston quick test system. By having the Ralston system you can then use a Ralston hose to connect to your calibrator. Please click on the options tab above to see the sizes and threads available for these female adaptors. The 3000 PSI ones have the check valve installed the 5000 PSI ones do not. Product code: QTHA-xFxO
