Reducing Coupling NFS Product Specification Part No. NPTF Thread (F) NPTF Thread (F1) 27143 1/4 1/8 27144 3/8 1/8 27146 3/8 1/4 27147 1/2 1/8 27149 1/2 1/4 27151 1/2 3/8 27153 3/4 3/8 27154 3/4 1/2