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The knockout fits 4” Triple wall pipe (thin wall) if you want the 3” or 4” pvc or abs, use sku 83355 in the inner collar at the bottom knockout. Use 20095 poly adhesive to glue

You can cut the channels at every 8" intervals between the two ribbed sections, which will give a male end fitting.

@ustrenchdrain7708 thank you. A video would be helpful but I'll try it.

you can cut along any of the 8" ribbed sections at the bottom of the channel to create a male fitting and rejoin to the female connection of another length, or use the convertor to connect a male to male fittings

Can these be drove over? The picture on Lowes.com shows a car crossing this drain in front of a garage.

@@HnRe42 yes If installed the right way. It’s very strong product and I’m purchasing another set soon

Thank you for the reply. Lowes has 24 pack for $599. That is by far the best grate drain system i have seen for even close to this price! I think I'm going to order for sure!!

What is the best tool to use to cut out the bottom pipe extensions?

Use the end cap multi pipe adaptor 83705 to connect 3" PVC or ABS pipe, or 3 " Corrugated into the catch basin.

@@ustrenchdrain7708 Thank you, much appreciated.

How do you cut drain? And what do you use to end it once cut?

I am installing the exact same compact drainage type in my yard in Australia - in the instructions it says to put suitable expansion material along each side of the drain to assist with future removal of the grates for cleaning etc, the concrete the contractors have layed on yours has most likely filled the space where the small clips have to pop to allow the grate to be removed.