The Drop Tube Weight is specifically engineered for Proactive's complete line of 12 volt peristaltic pumps. Simply attach the proper tubing over the stainless steel barb tip, then attach a stainless steel hose clamp to secure the tubing to the hose barb on the Drop Tube Weight. The Drop Tube Weight incorporates a filter screen to minimize debris and acts as a weight to minimize the sampling tubing from rolling up. The Drop Tube Weight is approximately 1 pound.