Modification & Maintenance We are highly experience contractor in Modification and Maintenance of Ventilation Ducting, Exhaust Fume System and Thermoplastic Piping which are the key elements required in many industries. CDM Door Modification Chemical System Modification Hepa Motor & Hepa Filter Change Drain Pipe Modification PP Drain Pipe Modification Modification of Sump Pit & Sump Tank Sump Pump Dosing Drain Pipe Modification