Q:What is the difference between Pol and QCC?
A:The QCC (Quick Closing Coupling) system has features built in to the valve and regulator assembly to ensure that it is safe. It can be connected and disconnected by hand and no spanner is required. QCC is approved for use indoors, whereas a POL connection is not.
The POL fitting is one of the oldest types of fittings. Because the POL valve's threads are on the inside of the connector, this type of valve requires a wrench to tighten it. For transporting or storing the propane tank, a plug is screwed into the valve.