Straight Reducers PI201612S Straight reducer, 1/2" OD x 3/8" OD £0.92 NC2511 Straight reducer, 15mm x 3/8" £0.99 PI201206S Straight reducer, 3/8" OD X 3/16" OD £0.73 PI201210S Straight reducer, 3/8" OD x 5/16" OD £0.67 PI201006S Straight reducer, 5/16" OD x 3/16" OD £0.61