1600R-2 by Couplamatic | R1 & R2 Reusable Coupling | 1" Hose ID x 1-11-1/2 Thread Size | for 100R2 Thin Hose NPTF Male Solid | Straight | Trivalent Zinc PlatingDescription: Non Mandrel and No Skive. Trivalent Zinc Plating. 1. Screw socket onto hose (left hand thread) until hose bottoms. Back out 1 4 turn. 2. Lubricate insert threads and I. D. of hose. Screw insert into socket until insert hex touches socket. Part Number Hose ID Pipe Size Thread Size Hose Type 403R 1 1 4" 1 4" 1 4 18 100R1 Thin 403R 2 1 4" 1 4" 1 4 18 100R2 Thin 603R 1 3 8" 3 8" 3 8 18 100R1 Thin 603R 2 3 8" 3 8" 3 8 18 100R2 Thin 803R 1 1 2"