Seaflo MNPT Elbow 12.7 mm (1/2") FNPT x MNPT | 4Boats12. 7 mm (1 2") MNPT elbow fitting for reliable threaded connections in marine plumbing. Size: 1 2" 14 FNPT x 1 2" 14 MNPT Fitting Type: MNPT Elbow Fitting Size (metric first): 12. 7 mm (1 2") FNPT x 12. 7 mm (1 2") MNPT Threads: female NPT (FNPT) x male NPT (MNPT), 1 2" 14 Use: threaded marine plumbing, bilge and pump connections Design: compact, corrosion resistant for harsh marine environments Verify thread type and size before fitting; ideal for