Which is better, type A Fittings or type B PEX Fittings ?

When choosing between Type A and Type B PEX fittings, it is critical to understand how they relate to PEX pipe types and their respective applications.

Type A PEX fittings: Type A PEX fittings are designed for use with Type A PEX pipe that has been cross-linked via the peroxide method (PEX-A).

**Advantages**:
1. **Flexibility**: Type A PEX pipe is more flexible and can be used with expansion fittings (F1960 fittings). This flexibility can make installation easier in tight spaces.
2. **Freeze resistance**: Type A PEX tends to have better freeze resistance due to its ability to expand and contract slightly in ice water.
3. **Durability**: Generally more resistant to damage and has a higher degree of cross-linking, resulting in better long-term performance.

**Disadvantages**:
1. **Cost**: Type A PEX fittings and pipe can be more expensive due to the manufacturing process and advantages such as flexibility and freeze resistance.
2. **Special Tools Required**: Installing Type A PEX fittings often requires a special expansion tool, which may cost extra if you don’t already have one.

Type B PEX Fittings：Type B PEX fittings are designed for use with Type B PEX pipe (PEX-B) that is cross-linked via the silane method.

**Advantages**:
1. **Cost**: Due to a simpler manufacturing process, Type B PEX fittings and pipe are generally less expensive than Type A options.
2. **Durability**: Type B PEX has good chlorine resistance and is less susceptible to scaling and pitting.

**Disadvantages**:
1. **Rigidity**: Type B PEX pipe is generally not as flexible as Type A. This rigidity can make installation more challenging in areas with large bends or where flexibility is required.
2. **Freeze Resistance**: Type B PEX may not be able to handle freezing conditions as well as Type A PEX. It is less likely to expand slightly if the water inside freezes.

Ultimately, the “better” choice depends on your specific project needs, budget, and installation environment. Each type of PEX fittings and tubing has its advantages, so choosing the right ones requires balancing these factors to meet your requirements.