Grommets for Hydroponic systems and water reservoirs.
A hole is drilled and the Grommet is inserted into the hole. When piping or pipe fitting is then pushed into the grommet. This will form a water tight connection.
12mm (inside diameter) Ring Rubber Grommet
15mm (inside diameter) Ring Rubber Grommet
20mm (inside diameter) Ring Rubber Grommet
25mm (inside diameter) Ring Rubber Grommet
6mm Top Hat Grommets fit 5mm piping
16mm Top Hat Grommets fit 12mm piping
19mm Top Hat Grommets fit 15mm piping
Hole Saw Sizes for Grommets – Please note: these hole saw sizes are for flat surfaces not for curved surfaces.
12mm Ring – 19 mm Hole Saw
15mm Ring – 19mm Hole Saw
20mm Ring – 25mm Hole Saw
25mm Ring – 31mm Hole Saw
6mm Grommet for reservoir – 9mm drill bit or Hole Saw
6mm Top Hat – 10 mm drill bit or Hole Saw
16mm Top Hat – 19mm Hole Saw
19mm Top Hat – 21mm Hole Saw
The correct size hole is cut with a hole saw and the grommet inserted then finally the grommet fitting is pushed into the grommet. It is not recommended that Petroleum Jelly is used as a lubricant. A silicon lubricant though more expensive is better.
Please note if grommet is fitted and then taken out a number of times, it may stretch.