Hose for connecting 3/8 inch nipple
. The 3/8&quot; hoses that you have will not thread to a 3/8&quot; pipe nipple since the connectors are for 3/8&quot; compression fittings which are different than 3/8&quot; pipe. You need to find/buy flexible hoses with connectors that connect to 3/8&quot; pipe. Talk to the people in the store that you are purchasing the hoses from to get the correct ones. Also, add a picture of what you are trying to accomplish. You may be able to adapt washing machine hoses or something similar for your use.