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Series 957 Reduced Pressure Zone Assembly with Flood Sensor
Watts Water Technologies, Inc. · 957, 2 1/2 in - 10 in
Written by BuildSpec from the manufacturer engineering specification ES-957 2423 and the manufacturer own product page. NOT marketing copy and NOT a rehosted document. *** THIS ROW EXISTS TO BE READ NEXT TO watts-957rpda, AND THE PAIR IS THE FINDING OF RUN 1061. Same family, same 2423 revision batch, same housing, same 175 psi and 33-140 degF envelope. THE PLAIN RPZ SHEET PRINTS UL CLASSIFIED AND FM APPROVED. THE DETECTOR ASSEMBLY SHEET - the model whose bypass meter exists specifically to police a fire sprinkler line - PRINTS NEITHER. The credential that makes a backflow assembly acceptable on a fire service line appears on the sheet for the product that makes no fire claim, and is missing from the sheet for the product that does. *** Neither row borrows from the other.
BIM Available✓ Verified 2026-09-14
Certifications & Standards
Foundation for Cross-Connection Control and Hydraulic Research, University of Southern California Printed on ES-957 2423 as the certifying body. UFGS 21 13 13 paragraph 2.5 states that listing of the specific make, model, design and size in the FCCCHR List is acceptable as the required documentation. NO LISTING NUMBER IS PUBLISHED and the FCCCHR List is NOT HELD in this corpus, so the credential is named, not verified. The FCCCHR directory was NOT consulted.
AWWA (standard issuer; no certificate published) Printed verbatim on ES-957 2423, prefix, number and -97 edition suffix all legible. One of the four standards IPC 2021 Table 608.1 names for this device class. NOTE THE EDITION DRIFT WITHIN ONE CORPORATE FAMILY, recorded and not reconciled: Watts 957 prints C511-97, Ames 4000SS prints C511-92 (r718), Febco 825Y prints the designation with no edition at all (r739). Three Watts-owned brands, three different renderings of the same standard.
UL Printed on ES-957 2423. *** WHAT IS CLAIMED HERE IS EXACTLY WHAT IS PRINTED AND NO MORE. The sheet does not say WHAT the assembly is Classified for - no UL category code, no file number, no statement of fire protection service. So this row records that a UL mark is claimed; IT DOES NOT ASSERT that the assembly is listed for fire protection use within the meaning of UFGS 21 13 13 paragraph 2.5. The r1050 CENTRIA rule - a mark is not a listing - is applied to a mark that is at least named in text rather than shown as a logo, which is why it is recorded at all.
FM Printed on ES-957 2423. FM Approvals operates in the fire protection domain, and it is TEMPTING to read FM Approved as satisfying the listed for fire protection use limb of UFGS 21 13 13 paragraph 2.5. THAT INFERENCE IS REFUSED: no approval class (e.g. FM 1210) and no approval number is printed, and the sheet makes no fire service statement anywhere. The limb is recorded as NAMED-BUT-UNCATEGORISED, not satisfied.
NONE EXPRESS NEGATIVE. ASSE 1013 is the reduced pressure principle backflow preventer standard, the first entry in the IPC 2021 Table 608.1 row for this class and the first standard named in UFGS 21 13 13 paragraph 2.5. It is absent. NOT SUPPLIED BY US. Worth stating plainly because the sibling brands DO print it: Ames 4000SS (r718) and Febco 825Y (r739) both name ASSE 1013.
NONE AWWA M14 is required by UFGS 21 13 13 paragraph 2.5; the two CSA documents complete the IPC Table 608.1 row. None appears. None is supplied.
What was checked, and what is deliberately not claimed
- Bim
- bim_url is a LINK to the manufacturer own Revit family (.rfa) on watts.com/dfsmedia/. NOTHING IS REHOSTED.
- Express_negatives
- ASSE 1013, ASSE 1015, AWWA M14, CSA B64.4, CSA B64.4.1 and NSF/ANSI 61 or 372 are ALL ABSENT from ES-957 2423. UL and FM are named WITHOUT category, class or number.
- Transcription_caveat
- An older URL for the SAME asset id 598004 (.../598004-source/es-957-fs-2230, resolved off-host) serves the SAME document and was retrieved first this run. The URL slug says fs-2230 while the document prints ES-957 2423. URL SLUGS ON THIS HOST DO NOT TRACK THE PRINTED FORM NUMBER and must not be used to identify a Watts document - a trap worth recording for any future run on this literature library.
Attributes — product claims, not third-party certifications
reduced pressure zone assemblybackflow preventer304 stainless steelflood sensorgroove endhigh hazardUL ClassifiedFM ApprovedRevit family published
Sustainability
No sustainability metrics on file for this product.
Applies to Code Sections
Code sections where this product or product category is relevant. Click through to the viewer for full text and commentary.
backflow protection of a potable water supply against high or low hazard cross-connections, backpressure and backsiphonagereduced pressure principle assembly where the authority having jurisdiction requires an FCCCHR-listed device