Why Plastic PEX Fittings are Just as Good (If Not Better) Than Metal

Family Handyman

When deciding between plastic and brass PEX (cross-linked polyethylene) fittings for plumbing applications, it can be challenging to determine which is the better choice. Historically, many have believed metal to be superior, but recent trends and data offer a new perspective.

Plastic vs. Brass PEX Fittings

When deciding between plastic and brass PEX (cross-linked polyethylene) fittings for plumbing applications, it can be challenging to determine which is the better choice. Historically, many have believed metal to be superior, but recent trends and data offer a new perspective.

Popularity Among Professionals

One of the significant indicators of the shift in preference is that professional plumbers are increasingly opting for plastic fittings over brass. In fact, their purchasing habits reveal that they buy plastic fittings at a rate three times greater than brass. This trend suggests a growing confidence in the quality and reliability of plastic PEX fittings.

Cost Considerations

Economics also play a role in this shift. Brass fittings tend to be considerably more expensive than their plastic counterparts – costing approximately five times as much. For many professionals, especially those who bear the cost of materials in their projects, this price difference can be a decisive factor.

Reliability and Trust

The increased adoption of plastic fittings isn’t solely due to cost. Plumbers prioritize the longevity and dependability of their work to avoid return visits for repairs, which can be both costly and damaging to their reputation. The rising preference for plastic indicates a broad professional trust in its durability and performance. This trust is mirrored by manufacturers, who often offer warranties for plastic fittings that are comparable, if not identical, to those for brass fittings.

Exceptions and Considerations

While plastic PEX fittings have many advantages, they aren’t universally applicable. There are scenarios where metal fittings remain the go-to choice:

• UV Exposure: Metal fittings are mandatory in situations where the fitting might be exposed to UV light, as plastic can degrade upon prolonged UV exposure.
• Proximity to Heating Devices: Plastic pipes and fittings shouldn’t be used within 18 inches of water heating devices, likely due to concerns about the plastic’s ability to withstand higher temperatures.

Local Building Codes

Always consult local building codes before making a decision. Regulations might have specific requirements or restrictions concerning the type of fittings you can use in certain situations.

Decision Between Plastic and Brass PEX Fittings

While brass fittings have long been a staple in plumbing, the rise of plastic PEX fittings – driven by professional trust, economic benefits, and comparable warranties – suggests a changing landscape. However, it’s essential to consider the specific needs of each project and any local regulations before making a final choice.