Steel Dragon Tools 51005 Nipple Chuck Kit Model 819 NPT 1/2"- 2" fits RIDGID Pipe Threading Machine The 819 nipple chuck is a quick and easy tool for holding short and close nipples or studs for threa Holds short or close nipples for threading For use with 300 Power Drive, 300 Compact, 535 and 1822 (with adapter kit) and 1224 Threading Machin Model Number: 819 Standard Nipple Chuck includes insert and 5 adapters: 1/2", 3/4", 1", 1 1/4" and 1 1/2".