Horobin’s MDPE/HDPE test plugs are available for use with small bore copper, steel or MDPE/HDPE piping from 25mm up to 75mm outside diameter and are suitable for pressure testing up to 6bar. These MDPE/HDPE test plugs are often used in telecommunications, refrigeration, air conditioning, heating, process plant and food manufacturing. "Double Seal" plugs can also be supplied to order and the steel components are zinc plated and tested to 90 hours salt spray