19740 Source Tank Filter For 134A units. Protect your investment from debris and harmful elements from tank manufacturing processes. Metal debris can foul solenoids causing unnecessary repairs and equipment failures. Install this filter on the hose end of your tank add hose to protect your machine. 100 mesh screen is replaceable or cleanable. 1/2" Female ACME X 1/2" Male ACME fittings Installs inline of tank fill hose. This special filter fitting is used inline between the tank fill hose and the virgin refrigerant tank to help prevent any tank debris from getting inside the A/C RRR machine. Simply screw the filter fitting onto the tank, and then connect the tank fill hose to end of the fitting. Instructions are included that tell the user how to install the fitting and how to clean the filter when necessary.