Top hat grommets are used in conjunction with take-off fittings, tubing and barbed irrigation fittings. They provide a seal around the fitting through a wall in a plastic containter, usually to provide a small diameter poly pipe branch from a large supply pipe.

The grommets fit inside a hole drilled in the supply pipe, or a reservoir container of water or nutrient for a garden or series of pots. 


Aqua Gardening Stocks a series of sizes of Top Hat Grommet including:

  • 6mm internal diameter (use holesaw size 10mm)
  • 13mm internal diameter (use holesaw size 16mm)
  • 19mm internal diameter (use holesaw size 22mm)


How to Use a Top Hat Grommet

Drill a hole according to the holesaw sizes above, clean any burrs, insert the top hat grommet, and then push the tube or barbed fitting through the grommet.


Top Hat Grommet Tips

  1. For additional leak protection, we recommend some silicon around the rim of the grommet before insering it into the hole.
  2. For hard rubber grommets (manufacturing quality varies), knead the rubber grommet in your hands before inserting it into the hole and connecting to it.


(SKU: 125451)

This calculator will show you the delivery charges for this product only.

Free Shipping Eligibility

  • Aqua Gardening offers free shipping on most orders above $100 that are not bulky and are sent to metro areas.  Once you place all the items you wish to buy in the cart, the combined shipping price will be shown in the cart, including Free Shipping if you are eligible. For full details please see our free shipping eligibility here.

Delivery Information

  • Back Order products - These are products we usually carry in stock but are temporary out of stock. These products will be back in stock within a few days. We can send you an email notification when they are back in stock if you click on the “Notify me when back in stock” link. See the full details here.
  • Special Order products - These are products that we do not regularly stock. These products will be ordered specially for you, or dispatched directly to you from our supplier. See the full details here.
  • Online Only products - These are products that are in stock in a different warehouse and can’t be picked up with the Click & Collect option. If you wish to collect these products from our Brisbane showroom, you can enter our address as the delivery address. Shipping costs may apply. See the full details here.
  • Click & Collect Only products - These products can only be collected from our Brisbane showroom as we can not ship them. If you place any of these products in your cart, you will only see the Click & Collect option at the checkout.
  • Fast Dispatch products - These are products that we have in stock in our Brisbane showroom, and they are available for immediate Click & Collect or Shipping. Keep in mind that if you have a product which is not listed as a Fast Dispatch product in your cart, there might be a delay on your order. See the full details here.


5 Years (Replacement Warranty - Store warranty, this product needs to be returned to Aqua Gardening for testing and replacement. )


60 Day Returns - We will provide a refund, exchange or store credit where you have decided you no longer want the product and it is in new, unopened condition. More details.