When choosing brass pump fittings, there are several factors to consider to ensure they meet your needs and provide reliable performance. Here's a guide to help you make an informed decision:

1. Material Quality: Brass pump fittings are typically made from different grades of brass, such as brass alloy C36000 or C37700. Look for fittings made from high-quality brass materials known for their durability, corrosion resistance, and overall strength.

2. Compatibility: Consider the compatibility of the brass pump fitting with your specific pump system. Ensure that the fitting is designed to connect with the type and size of pump you have. Check the thread size and connection type to ensure it matches your pump and other components.
   

3. Fitting Type: Determine the specific type of fitting you need based on your pump system requirements. Common brass pump fittings include threaded fittings, couplings, elbows, tees, adapters, and connectors. Choose the fitting type that best suits your installation needs.

4. Pressure Rating: Check the pressure rating of the brass pump fitting. This indicates the maximum pressure it can withstand without risk of failure or leakage. Ensure that the fitting's pressure rating meets or exceeds the operating pressure of your pump system.

5. Size: Consider the size of the brass pump fitting, including the thread size and overall dimensions. Ensure that it matches the size of your pump's inlet and outlet ports or other connecting components. Proper sizing is crucial for a secure and leak-free connection.

6. Seal and Connection Method: Evaluate the seal and connection method used by the brass pump fitting. Common methods include threaded connections, compression fittings, or barbed connections with hose clamps. Choose the connection method that is suitable for your specific pump system and ensures a tight and reliable seal.

7. Corrosion Resistance: Brass is known for its resistance to corrosion, but it's still essential to choose fittings with additional protective coatings or treatments. Look for fittings with features like nickel plating or brass with higher zinc content to enhance corrosion resistance, especially if you will be using the fitting in environments with exposure to moisture or chemicals.

8. Application: Consider the specific application of the brass pump fitting. Whether it's for plumbing, irrigation, industrial processes, or other applications, ensure that the fitting is designed and rated for the intended use. Some fittings may have specific features or designs tailored to certain applications.

By considering these factors, you can choose brass pump fittings that are compatible with your pump system, provide reliable performance, and offer long-lasting durability.