Facilitate seamless connections in your pneumatic systems with this straight plug-in reducing coupling. Designed for efficient air flow, it allows for easy connection and disconnection of tubing, adapting from a 6mm diameter to a 4mm diameter. Constructed with durable brass and plastic materials, this coupling ensures reliable performance in a variety of industrial and commercial applications.This is a HYDROLICO ZPGJ06-04 reducing coupling designed for pneumatic systems. It features a straight, plug-in connection type and reduces tubing diameter from 6mm to 4mm. The coupling is made from a combination of brass and plastic materials. It is available and in stock.