Standards pages often show several dates. Before updating a specification, distinguish a published revision from a proposal that is still part of the standards-development process.
The published record
At our 19 October 2026 source check, UL Standards & Engagement listed UL 448 edition 12 with a last revision dated 4 September 2025. Its topic summary identifies changes relating to a single-phase-motor exception, hydrostatic testing of proprietary column flanges, and construction and marking provisions.[1]
What the 2026 dates represent
The same catalogue page lists CSDS proposals dated 24 April and 28 August 2026. The publisher identifies these as proposals. Their appearance is not evidence that the proposed wording has become a published UL 448 requirement.[1]
How to use the information in a project
Our recommendation is to keep a small standards register alongside the technical submittal. Record the required standard, edition or revision, the project specification that invokes it and the party who accepted that basis. Where a requirement is ambiguous, request a written clarification rather than copying an isolated update headline into the purchase order.
Ask the supplier to identify the applicable certification record for the offered pump, and to explain any change that affects the proposed construction or rating. The existence of a newer revision does not, by itself, tell you the status of every previously certified model.
Do not infer the detail from a headline
The public topic summary is a useful starting point, not the complete clauses or a project-specific interpretation. This article does not reproduce the standard, establish transition dates, or determine whether an exception applies to a particular pump set. Use the complete applicable text and the certification body or project reviewer for that decision.
Use the publisher's revision record for standards tracking, and the actual product record for certification verification. Keep proposals labelled as proposals.
Sources & further reading
Source records checked 19 October 2026. Linked publishers may subsequently revise their content. The relevant complete document and project requirements govern.