TT FLEX Stainless Steel Corrugated Water Heater Connector Flexible for Water Heater Water Softener,3/4" FIP x 3/4" FIP, 24" Length (2 Pack) - Amazon.com
Halex, 3/8 in. Flexible Metal Conduit (FMC) Squeeze Connectors , 04203B, 50 per pack - Conduit Fittings - Amazon.com
Halex 1/2 in. Flexible Metal Conduit (FMC) Squeeze Connector (3-Pack) 20421 - The Home Depot
EZ-Fluid 1-Inch FIP x 3/4-Inch FIP x 18-Inch Corrugated Flexible Stainless Steel Water Heater Connector For Female Iron Water Pipes Fitting Also For Water softener,Filter, (1-Pc) - Amazon.com
90 Degree Squeeze Connector for Flexible Metal Conduit — Primus Cable