2" Netpot lifter / spacer.  In my 2x3 rain gutter downspout NFT hydroponic setup ( RGGS ) the netpots were sitting so close to the bottom of the downspout that I was not satisfied that the plants were getting enough of an airgap or enough space for the roots to travel properly when the plants got bigger.  Quickly whipped these up and it seems like the added airgap is definitely helping the plants go more happily.

I added a lip at the bottom to accommodate a larger hole size.  In the cover photo it looks like there is a lip at the top and the bottom but the one at the top is the actual net pot.

If you want a better way to block out light, check out my 2" netpot light covers