Brass Tee Fitting 1/4 X 3/8 pack of 2

Function and technical context

The 1/4" x 3/8" brass union is a reducing coupling that connects pipes or hoses of different diameters within the seawater cooling circuits of outboard and stationary engines. Manufactured in brass, it offers superior resistance to marine corrosion compared to conventional steel fittings, ensuring lasting sealing in humid and saline environments. Its function is to ensure the continuity of water flow through the cooling system, so any leak or rupture at this point can result in coolant loss and, as a direct consequence, engine overheating. This pack includes 2 units, allowing you to have an immediate spare or carry out installations requiring multiple simultaneous connection points.

When to replace this part?

The most common symptoms indicating deterioration of a brass union are the appearance of moisture or visible dripping at hose connections, limescale or verdigris deposits accumulated around the fitting, and in advanced cases, the engine high temperature alarm due to cooling deficit. It is recommended to visually inspect these fittings at each seasonal maintenance, paying special attention to possible cracks or deformations in the threads. Replacing the union preventively at the slightest sign of deterioration avoids failures due to overheating that can result in much more expensive engine repairs.

Equivalent manufacturer references