This is a replacement fitting (1pc) that can be used on any of our pumps, however it is made exclusively for our advanced pumps. Pumps up to Ultimate can handle everything on 1/4″ line without a bottleneck. Advanced pumps going over 20 nozzles must have 3/8″ fittings like this one on both of the ports. 3/8″ NPT male on one end and 3/8″ push to connect fitting on the other end. Made of nickel plated brass, this fittings is very durable. Push to connect for easy tube removal. Use it only on advanced pumps.