3/8" swivel to 1/4" NPT (male thread). This fitting allows you to connect 1/4" NPT to our screw-in quick connect fitting and provides a swivel to the fitting connection. 3/8" swivel to 1/4" NPT (male thread). This fitting allows you to connect 1/4" NPT to our screw-in quick connect fitting and provides a swivel to the fitting connection.