Active Aqua Rubber Grommet, 1/2", pack of 25
Active Aqua Rubber Grommet, 1/2", pack of 25 at HorticultureSource.com -
Hydrofarm Hydrofarm 1/2" Rubber Grommet (HGGR50) Rubber grommet will provide a watertight seal in DIY systems. For use with 1/2" connectors.  Manufacturer's Product Information MSRP each $ 0.48 UPC 638104005654 Dimensions 1.01 x 0.63 x 1.01 Case Weight 1 Case Quantity 25