Irritec Top Hat Grommet
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Product Description
Top Hat grommets are used with single barb barbed style fittings when installing in a more rigid material, such as PVC pipe, to get a more complete leakproof seal. 
400 Barbs with Top Hat Grommet require a 9/16" drilled hole (minimum 1" diameter PVC pipe size)
420 Barbs with Top Hat Grommet require a 16mm or 5/8" drilled hole (minimum 1" diameter PVC pipe size)
700 Barbs with Top Hat Grommet require a 3/4" drilled hole (minimum 1-1/2" diameter PVC pipe size )
825 Barbs with Top Hat Grommet require a 15/16" drilled hole (minimum 3" diameter PVC pipe size)
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