Drain Clamp with 3/8" connection. PN S1117-01
For drain lines that come down from the Air Gap Faucet.

Reverse Osmosis systems ( like Microline ) use a 3/8" drain line that comes down from the Air Gap Faucet.
The drain line is 1/4" from the RO unit and runs up to the Air Gap Faucet
Non Air Gap systems typically use the 1/4" drain line connection, where the line comes directly from the RO unit itself.