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March Garden Task for Zone 8b
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The .400" Barb Grommet (Top Hat Grommet) is the industry-standard solution for transitioning from rigid PVC pipe to flexible drip tape or polyethylene tubing. Acting as a watertight seal, this grommet fits snugly into a drilled hole in your PVC header, creating a receptive port for any .400 barb takeoff adapter. For a precise, leak-free installation, we strongly recommend using our specialized Grommet Drill to create the perfect 9/16" hole.
Commonly used in commercial agriculture and greenhouse setups, these irrigation fittings eliminate the need for expensive PVC tees or glue-in saddles. The "Top Hat" shape ensures the grommet cannot be pushed all the way through into the pipe, while the tapered internal walls compress around the inserted barb to withstand pressure surges and prevent blowouts.
Ensure you drill the correct size hole for a secure fit.
| Specification | Details |
|---|---|
| Product Type | Top Hat Grommet |
| Drill Hole Size | 9/16" (Use Grommet Drill) |
| Fits Fitting Size | .400" Barb (Standard Takeoff) |
| Minimum Pipe Size | 1" PVC or Larger |
| Material | Thermoplastic Rubber (UV Resistant) |
| Max Pressure | Up to 60 PSI (Dependent on pipe rating) |
| MPN | 12290031 |
| Common Brand Names | Jain, Irritec, Antelco |
Install takeoffs into PVC in three easy steps.
Step 1: Drill the Header
Using a 9/16" Drill Bit, create a clean hole in your 1" or larger PVC pipe. Ensure you remove any plastic burrs from the edges of the hole.
Step 2: Insert the Grommet
Push the grommet into the drilled hole until the wide "brim" (the Top Hat) sits flush against the outside of the pipe. You may use a little water as lubrication if needed.
Step 3: Insert the Barb
Take your .400 barb fitting (sold separately) and push it firmly through the grommet. The barb will expand the rubber inside the pipe, locking it in place and creating a watertight seal.
Verify your sizes before drilling:
Get the right tools and fittings for your grommet installation:
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