Caterpillar Hydraulic Breather 356-7423. No box they were damaged part is perfectly good.

breather for a hydraulic tank is a device designed to regulate the pressure and maintain the cleanliness of the tank. It serves two primary functions pressure equalization and contamination prevention. It allows the exchange of clean air between the tank and the environment, preventing the formation of a vacuum or excessive pressure. The breather typically consists of a filter element and a cap. The filter element helps to keep out contaminants such as dust, dirt, and moisture from entering the hydraulic system. The cap provides a barrier to prevent the entry of larger particles or debris.

Attributes:

• Captures and prevents contaminants such as dust, dirt, and moisture from entering the hydraulic system.

• Allows excess pressure inside the tank to escape, preventing over-pressurization.

• Designed to resist moisture ingress, helping to maintain the dryness and integrity of the hydraulic fluid.

• Constructed with materials resistant to corrosion, chemicals, and temperature fluctuations for long-lasting performance.

Applications:

A breather is an important component in a hydraulic system to maintain the pressure balance inside the hydraulic tank. It is extensively used in Cat C13B, C11, TH35, and TH38 Powertrain, 1706D, 1706J, 2206D, 2206F, 2406J, 2506, 2506D, 2506F, 2806, 2806D, 2806F, C13, C13B, C15, C18, C9.3 and C9.3B Engine (Piston), 621, 621G, 621H, 621K, 623, 623G, 623H, 623K, 627, 627G, 627H, 627K, 631, 631G, 631K, 637, 637G, 637K, 651B and 657G Wheel Tractor Scrapers, 725, 725C, 730, 730C, 735C, 740, 740C, 745, 745C, 760, AD22, D250E, D300E, D350E, and D400E Articulated Trucks, 7495 Surface Extraction, 794 and 795F Truck, C13B and C9.3B Power Systems.