Ace Glass 5842-10 Ace-Thred, #25 to 15 Nylon Reducing Coupling with Back Seal

For coupling threaded columns together or to end fittings with single O-Ring seal for leak tight engagement with hand pressure and no significant size reduction in I. D. One end threaded for the next smallest diameter. Size listed refers to inside diameter of threads. Supplied with two FETFE O-Rings. Use with 5820 and 5821 columns.