This sealing grommet works like a bulkhead fitting allowing the connection of 1/2" tubing to a tray or other container. Use the grommet to make a water tight seal in plastic material up to 1/8" thick. For a watertight fit, drill a 13/16" hole and insert the grommet then push a 1/2" connector through the grommet. This part is essential for those of you who are building their own system.
Eaton Wiring Devices item 77-BOX
Bushing Rubber for 0.875" Dia Hole
For 1/2" Knockout
Item Number: 414007
Manufacturer: Greentrees Hydroponics
Manufacturer's Part Number: 241164
Brand: Multi Flow