1. Introduction
This manual provides comprehensive instructions for the proper installation, operation, and maintenance of the Parker 6606 25 00 Tube Fitting. Please read this manual thoroughly before using the product to ensure safe and efficient operation.
The Parker 6606 25 00 is a straight, equal tube fitting designed for fluid system connections, specifically with a 25mm dimension.

Figure 1: Front view of the Parker 6606 25 00 Tube Fitting.
2. Product Overview
The Parker 6606 25 00 Tube Fitting is a critical component for creating secure and leak-free connections in various industrial fluid systems. Its robust design ensures reliable performance under specified operating conditions.
Key Features:
- Model: 6606 25 00
- Type: Straight, Equal Tube Fitting
- Size: 25mm
- Dimensions: Approximately 0.31 x 0.31 x 0.24 inches
- Weight: Approximately 4.8 ounces
- Brand: Parker

Figure 2: Angled view of the Parker 6606 25 00 Tube Fitting.
3. Setup and Installation
Proper installation is crucial for the performance and longevity of the Parker 6606 25 00 Tube Fitting. Follow these steps carefully:
- Preparation: Ensure all components are clean and free from debris. Verify that the tube ends are properly cut and deburred.
- Component Assembly: Slide the nut, then the back ferrule, and finally the front ferrule onto the tube. Ensure the ferrules are oriented correctly.
- Tube Insertion: Insert the tube into the fitting body until it bottoms out.
- Nut Tightening: While holding the fitting body steady, tighten the nut finger-tight. Then, using a wrench, tighten the nut 1-1/4 turns past finger-tight for sizes 1/4" to 1" (or equivalent for 25mm). For larger sizes, consult specific Parker torque specifications.
- Inspection: Visually inspect the connection for proper alignment and tightness.
Warning:
- Do not overtighten the nut, as this can damage the fitting or tube.
- Do not use damaged components.
- Ensure compatibility with the fluid system pressure and temperature ratings.

Figure 3: Close-up view of the Parker 6606 25 00 Tube Fitting, illustrating connection points.
4. Operating Guidelines
Once installed, the Parker 6606 25 00 Tube Fitting operates passively as a connection point within a fluid system. No active operation or user interaction is required from the fitting itself during system operation.
Ensure the system pressure and temperature remain within the specified limits for the fitting and the overall system. Regular monitoring of the system for leaks or anomalies is recommended to maintain optimal performance and safety.
5. Maintenance
The Parker 6606 25 00 Tube Fitting is designed for long-term reliability with minimal maintenance. However, periodic checks are recommended to ensure continued integrity of the fluid system:
- Visual Inspection: Regularly inspect the fitting for any signs of corrosion, physical damage, or leaks. Look for discoloration, cracks, or drips around the connection points.
- Leak Detection: If a leak is suspected, immediately depressurize the system before attempting any inspection or repair. Do not attempt to overtighten a leaking fitting; instead, disassemble, inspect components for damage (e.g., deformed ferrules, scratched tube), and reassemble with new components if necessary.
- Cleaning: If cleaning is required, use a soft cloth and a mild, non-abrasive cleaner. Avoid harsh chemicals, solvents, or abrasive materials that could damage the fitting's surface or material properties.
Caution:
- Always depressurize the system completely before performing any maintenance, disassembly, or reassembly of the fitting.
- Replace damaged components with genuine Parker parts to ensure system integrity and performance.
6. Troubleshooting
This section addresses common issues that may arise with tube fittings and provides potential solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Leak at connection point |
|
|
| Difficulty inserting tube |
|
|
7. Specifications
Detailed specifications for the Parker 6606 25 00 Tube Fitting:
- Model Number: 6606 25 00
- Brand: Parker
- Type: Tube Fitting, Straight, Equal
- Nominal Size: 25mm
- Product Dimensions (Approximate): 0.31 x 0.31 x 0.24 inches (0.79 x 0.79 x 0.61 cm)
- Item Weight (Approximate): 4.8 ounces (136 grams)
- Manufacturer: Ritter Technology, LLC
- ASIN: B071G85BQF
- First Available Date: April 28, 2016
8. Warranty Information
Parker products are manufactured to high standards of quality and reliability. For specific warranty details regarding the Parker 6606 25 00 Tube Fitting, please refer to the official Parker warranty policy available on their corporate website or contact an authorized Parker distributor. Typically, warranties cover defects in material and workmanship under normal use and service conditions.
9. Customer Support
For technical assistance, product inquiries, or to report any issues related to your Parker 6606 25 00 Tube Fitting, please contact Parker customer support or your authorized distributor. When contacting support, ensure you have your product model number (6606 25 00) and any relevant purchase information ready to facilitate a quicker resolution.
You can find more information and contact details on the official Parker website: www.parker.com





