BLOCTUBE MARINE SERVICES LTD An ISO 9001-2000 accredited company With the company origins dating back over 100 years, Bloctube are recognised leaders in the manufacture of marine equipment:- Engine Controls ( Electro/Pneumatic), Emergency Telegraph Systems Rudder Angle Indicators, Engine and Propshaft RPM Systems, Remote Controlled Twin-beam Searchlights Pneumatic Logic Cabinet - Essjon Eng. Suppliers of:- Hydrostatic tank content gauges, Ships' whistles and controls