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Plumbing small parts
All Containers›Shop by use case›Plumbing small parts›What goes wrong›Free was read as noneShop all plumbing →
What goes wrong

Free was read as none

By Dwight Davis, Founder

On this page14
0.25 percent is not zero.

Lead free was read as containing no lead

It is a defined term meaning not more than a weighted average of 0.25 percent over the wetted surfaces, and not more than 0.2 percent for solder and flux.

So a product claim was read as an absolute

A lead free fitting contains lead within the threshold, and the threshold is what the term means.

The two figures were treated as one

0.2 for solder and flux and 0.25 for wetted surfaces. Different numbers measuring different things.

And the solder figure was assumed to be the looser one

It is the tighter one, which is deliberate: averaging a joint into a large fitting would dilute it to nothing.

The flat limit was treated as an average

Solder and flux have a composition limit with no averaging in it. Only the fittings figure is a weighted average.

The plain meaning was trusted over the definition

Which this library finds three times: a spice that has lost its volatile oil is not a spice, garlic is excluded for being a food, and new means not marketed before 1994.

Three defined terms and three wrong plain senses

Which is the argument for quoting a definition rather than summarizing one, and this one is two sentences long.

The scheme was assumed from the definition

What the Act prohibits, where it applies, the exemptions, the certification and the effective dates are all outside this property.

NSF certification was assumed to be federal

It is not, and it is what a product page usually carries in practice.

And a container was expected to be relevant

These are storage jars for small parts and are not plumbing components. Nothing here says any container is suitable for potable water contact.

Which it is not being asked to be

The container holds the part before it is installed, and the lead question is about the part in service.

Read the two sentences

Which is the whole of the definition, and the surprise is in the first half of each.

Then ask somebody who knows the scheme

Because the definition is the part this property can give you and the rest is not.

References

42 U.S.C. 300g-6(d), the definition of lead free. For solder and flux, "not containing more than 0.2 percent lead". For pipes and fittings, "not more than a weighted average of 0.25 percent lead when used with respect to the wetted surfaces of pipes, pipe fittings, plumbing fittings, and fixtures." This is a definition from the Safe Drinking Water Act; nothing on these pages describes what the Act prohibits, where it applies, the exemptions, the certification or the effective dates, or determines whether any article is lead free. law.cornell.edu
Written from 42 U.S.C. 300g-6(d) and from the catalog as it stood on 19 October 2026. That is a definition from the Safe Drinking Water Act and nothing here describes what the Act prohibits, where it applies, the exemptions, the certification or the effective dates, or determines whether any article is lead free. A weighted average over wetted surfaces is computed for a particular assembly and no computation is performed here. This shelf is shared identically by nine groups and the sewing notions property enumerates the inventory.