FITTING 1/2 x 18mm

Function and technical context

This 1/2" threaded fitting with an 18 mm outer diameter tube acts as a watertight connection point between rigid or flexible pipes within the hydraulic circuits of a boat, guaranteeing the passage of fluid without losses or infiltrations. It usually works in fuel supply systems, fresh or salt water cooling circuits and auxiliary fluid circulation lines in marine engines for nautical use. The integrity of this type of coupling is critical: a defective or deteriorated fitting can cause fuel leaks with the risk of fire, loss of pressure in the cooling circuit with consequent overheating of the engine, or air entry into the supply line that causes unexpected stops while sailing. Its medium pressure design makes it especially suitable in installations where the pipe layout requires changes in direction or accessible disassembly points for periodic maintenance.

When to replace this part?

The most common symptoms that indicate that a hydraulic fitting needs to be replaced are the appearance of moisture stains, dripping or fuel or coolant residue at the connection points, as well as oxidation marks, deformation of the threaded body or loss of tightness perceived as bubbling in the cooling circuit. This type of element must be inspected during each seasonal maintenance, checking the tightness, the condition of the thread and the absence of microcracks, especially after prolonged exposure to saline environments that accelerate corrosion. Replacing the fitting preventively if there is any sign of deterioration prevents major breakdowns – such as emptying of the cooling circuit or a fuel leak – which can be extremely costly and dangerous at sea.

Marine Engine Compatibility

Equivalent manufacturer part numbers