The Double H Interface provides the capability to directly interface 2 chips together and is designed for use with the Linear Connector 4-way (Part No. 3000024) to provide eight fluidic connections to 1.6mm OD tubing. An interface between 2 chips of dimensions 22.5 x 15 x 4mm is achieved via a precision perfluoroelastomer gasket aligned with the microchannels. One key application of the Double H Interface is in double emulsion generation. This requires one hydrophilic Droplet Junction Chip (Part No. 3000158 or 3000436) and one hydrophobic Droplet Junction Chip (Part No. 3000301 or 3000437) for the production of droplets inside droplets.