I recently just set up a new tank with a sump. I need another manifold block to my set up. I place an order. I got my order in 3 days. I also got the co2 reactor with it as well. Installation was very simple. Just remove the 2 Allen wrench screws. Add the new block in and use the new Allen wrench screws and that's it. Do not try to take out the Philip head screw. You will risk striping the head, it is on very tight. Also there is no point in removing the Philip head screw.