HomeFlex 11-429-101 3/4-Inch x 1/2-Inch Brass Corrugated Stainless Steel Tubing  x IPS Pipe Reducer Very high quality brass construction 3/4 in. CSST x 1/2 in. male pipe thread connection For use with Alpha-Flex CSST systems For use with natural sass or liquid propane CSA and IAPMO certified