Caterpillar (CAT) A-Series D-Ring & Flange Seal Kit | High-Pressure Hydraulic Connector Box

Secure your heavy-duty hydraulic connections with the CAT A-Series Flange Kit. The CAT A-Series (Box A) is the definitive assortment for sealing hydraulic flanges on Caterpillar equipment. Unlike standard O-rings, these D-Rings are engineered to fit SAE Code 61 and Code 62 split flanges, providing maximum resistance to extrusion under extreme pressure spikes. This kit is a "must-have" for preventing leaks at the most critical hose connections on your excavator.

• Specialized D-Ring Profile: Features the essential "D" shape profile required for secure seating in CAT hydraulic flange heads, preventing the seal from blowing out under load.

• High-Pressure Rating: Made from industrial-grade NBR 90 (Nitrile) material, designed to handle the massive pressure surges found in main pump lines and boom cylinders.

• Comprehensive A-Series Sizes: Covers the full range of standard flange sizes (3/4", 1", 1-1/4", etc.) commonly found on CAT excavators (E320, E330, etc.).

• Leak-Free Performance: Eliminates the common problem of "weeping" flanges, keeping your machine clean and compliant with environmental standards.

• Durable Storage: Housed in a sturdy, organized case with a size chart for instant identification of the right flange seal.