The 1/4 Female Pipe Thread x Female Prest-O-Lite is a propane fitting designed to connect FPT (Female Pipe Thread) connections to POL-style propane tank valves. This adapter allows for a secure and leak-free transition between propane gas regulators, hoses, and appliances requiring a female POL connection. It is commonly used in LP gas systems, heaters, grills, and industrial propane applications.