Frank,
The union connections have the fiber washer that is designed to provide seal to prevent leakage. It is important when installing them to not overtighten them or you will crush the washer and it will not seal no matter how tight you get the connection. The replacement washer part number is R50065. I would order two new sealing washers and then separate the unions and remove the old washers, wet the new washers and install them tightning the unions hand tight. Once hand tight you can give them another 1/2 to 3/4 turn using a wrench to snug the connection. Do not over thighten them. Evaluate the connection and snug up as necessary but it is important to not crush the washer. If you have any questions call Caleffi tech support anytime.
Frank,
The union connections have the fiber washer that is designed to provide seal to prevent leakage. It is important when installing them to not overtighten them or you will crush the washer and it will not seal no matter how tight you get the connection. The replacement washer part number is R50065. I would order two new sealing washers and then separate the unions and remove the old washers, wet the new washers and install them tightning the unions hand tight. Once hand tight you can give them another 1/2 to 3/4 turn using a wrench to snug the connection. Do not over thighten them. Evaluate the connection and snug up as necessary but it is important to not crush the washer. If you have any questions call Caleffi tech support anytime.