Reef tank loves this. Works well on a dosing pump.Excellent quality and overall a good box to buy. Just has one problem the top sits on top is not secure does not snap on or close really it just sits on top on an indentation and the indentation is not and exact fit with the size of the top. Other than that I would give it 5 stars.At a fraction of the cost of others this was worth a try. I got two of them. They look great and work well. The only problem is that they had an awful chemical smell. I let them sit for a week or two before I used them to get the smell out. They still smelled a little bit, but nothing like when I got them. I'd recommend them if you can let them sit for a good while before using them.I had to glue the acrylic tube to get a proper seal. Worked perfectly with my doserThe plastic line for some reason is not made Air tight. It adds air bubbles to the dosing line. I added super glue around the plastic insert and to solve this.The rigid tubing is not airtight which constantly creates bubbles and causes you to get inaccurate dosesGreat value. You might need to put some tefelon tape on the top end of the rigid tubing to create suction. Just unscrew the threaded fitting. It will take less than a minute. I am using it with BRS doing pumps and tubing.