Buyer Beware: Generic F1960 Expansion Fittings Can Negatively Impact Your PEX Installs

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The popularity of PEX in residential and commercial construction has produced an influx of engineered polymer (EP) F1960 expansion fittings claiming to be “just the same as Uponor ProPEX®”. However, these lower-quality F1960 fittings are putting systems and contractors at significant risk for leaks or poor performance.

Uponor ProPEX fittings are certified by a third-party agency, NSF International, to prove the product is designed and manufactured to the ASTM F1960 standard. In addition, ProPEX fittings also include additional internal quality testing that extends beyond ASTM F1960 standard requirements to provide a higher-quality product.

Some suppliers claim their fittings are compliant to F1960, which means, in their opinion, they meet the standard. However, there is no third-party agency to confirm that compliance. This confusion between certification and compliance is resulting in PEX piping installations with lower-quality connections that are putting systems at risk for failure and jeopardizing installers’ reputations.

Uponor has performed a random sampling of these lower-quality F1960 EP fittings and found them to have a reduced internal diameter — up to 50% in some instances. Additionally, Uponor has received claims for failed connections that, after investigation, were found to be different suppliers’ low-quality F1960 fittings.

Many generic F1960 expansion fittings have a thinner sealing barb and weaker tube stops compared to ProPEX fittings. Those differences can result in leaks that cost time and money to repair — and also damage a contractor’s reputation.

It is important to be vigilant when ordering and purchasing F1960 fittings. Ensure you are getting the superior quality of ProPEX that comes with a 25-year transferable limited warranty when used as a system with Uponor PEX-a pipe and ProPEX rings.

To learn more about the differences in ProPEX and how it can impact your business, visit

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