Hydro-Logic Float Valve for Tall Boy - 3/8 inch Down At this volume the headspace

At this volume the headspace is the thing to think about

1 GPH @ 60 psi Check Valve None Use Propagation humidity

the Grodan Pro Improved Slab 36" x 6" x 3" is more than just a substrate

these collars don't choke your cuttings

It holds material at 55%

Hydro-Logic Float Valve for Tall Boy - 3/8 inch Down At this volume the headspaceThis valve comes with a 3 8" quick connect fitting. Use this float valve to adjust water level and can be mounted horizontally or vertically. The kit allows you to fill a reservoir or tank, unattended, to your desired water level. These float valves are universal and will work with Hydro Logic, Active Aqua, Growonix, and other reverse osmosis equipment.