MI-4 Model manually operated diaphragm pump is used forgrouting small & medium cable ducts. The suction of fine cement grout is done by movement of diaphragm and one way pressure is retained by two ball lock valves provided at inlet & outlet line. The pump develops pressure up to 4kgs/cm2 (60psi) with out put discharge capability of 150/ltr/hr of neat cement grout approximately. Specially designed and machined hexagon brass non return valve& strainer at suction end ensures non choking of the system and also is easy to remove & clean making MI-4 maintenance free & cost wise. highly economical.