Threaded level indicators with hexagonal head made for checking the level of the hydraulic fluid on gearboxes, tanks and oil chambers in general. 
Plastic material: transparent polyamide resin, resistant to chemical agents, oils, petrol and various solvents. Avoid contact with alcohol in general, cleaning fluids containing alcohol, coolants at high temperatures and hot water over 80°C. 
Flat sealing gasket in asbestos-free fiber or (on request) in NBR 70 Shore synthetic rubber. 
Centerline red dot heat-serigraphed on the transparent visor; in the SLNT version a white plastic plate is applied on the back of the thread to improve the visibility of the level in low light conditions. 
Max operating temperature: 90°C.