This product comes to us from CM Becker and is part of the Inline flow control compensator. It is designed for use with the flow compensator only. You can use it with tubing that has an inside diameter (ID) of 3/8".
Three Piece Airlock
Safale US-05 Yeast
Star San Sanitizer - 16 fl oz (473 ml)
Dextrose - 1lb