Compatibility Guaranteed: Designed for optimal fit with ISO7241-A (ISO-A) Series. Enhanced Protection: Each set includes 4 male dust caps and 4 female plug covers, all crafted to prevent the wear and tear of hydraulic couplers. By keeping dirt and contaminants out, these caps and plugs maintain the cleanliness and longevity of your hydraulic system, thus avoiding costly downtime and maintenance. Durable Material and Firm Grip: Made from high-quality PVC rubber, these dust caps and plugs not only withstand harsh environments but also provide a snug fit that prevents accidental disconnections. The inclusion of a retention ring further ensures the cap remains attached to the hose, offering an extra layer of security. Color-Coded Convenience: This pack features 4 color-coded sets (one for each set), allowing for easy identification and organization of your hydraulic couplers. This not only speeds up the process of connecting and disconnecting but also reduces the risk of cross-contamination between different hydraulic lines. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:As Shown Material:rubber Size:3/8Inch/1/4Inch/1/2Inch Package Contents: 4Sets * Hydraulic Quick Coupler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.