Home / Products / Div 21 11 00 — 21 11 00 / Series 957RPDA Reduced Pressure Detector Assembly with Flood Sensor

Watts Water Technologies, Inc.Div 21 · Fire SuppressionNo manufacturer photo on file

Div 21 11 00 · 21 11 00

Series 957RPDA Reduced Pressure Detector Assembly with Flood Sensor

Watts Water Technologies, Inc. · 957RPDA, 2 1/2 in - 10 in

Written by BuildSpec from the manufacturer engineering specification ES-957RPDA and the manufacturer own product page. NOT marketing copy and NOT a rehosted document. The detector function is what separates this assembly from the plain Series 957: the bypass meter exists so that a fire service line, which should carry no flow at all between events, can be audited for theft and leakage. *** THE POINT OF INTEREST ON THIS ROW IS WHAT THE ENGINEERING SPECIFICATION DOES NOT SAY. ES-957RPDA NAMES EXACTLY TWO CREDENTIALS - FCCCHR-USC AND AWWA C511-97. IT NAMES NO ASSE 1013, NO UL LISTING AND NO FM APPROVAL, even though the same sheet states the assembly is metered to detect leakage or theft of water from the fire sprinkler system. Its sibling sheet ES-957, same product family and same 2423 revision batch, DOES print UL Classified and FM Approved. Those marks are NOT borrowed onto this row. ***

BIM Available✓ Verified 2026-09-14

Specs on this page were checked against Watts ES-957RPDA engineering specification / specification sheet, retrieved 2026-09-14 from www.watts.com/dfsmedia/ - the manufacturer own domain and own literature library, on a host whose robots.txt disallows only the Sitecore authoring tree. THE DOCUMENT URL WAS TAKEN FROM THE MANUFACTURER OWN 957RPDA PRODUCT PAGE, NOT FROM A SEARCH INDEX - the r1059 amendment prefers a URL the manufacturer itself currently links over one a search engine remembers. The product page (watts.com/products/.../957rpda) was retrieved in the same run and is recorded as product_url; IT IS NOT USED AS source_url because it names no standard or certifying body at all and refers the reader to the specification sheet. on 2026-09-14.

View on manufacturer site →Spec Sheet (PDF)Download BIM (RVT)

Certifications & Standards

Foundation for Cross-Connection Control and Hydraulic Research, University of Southern California Printed on ES-957RPDA as the certifying body. THIS IS THE LOAD-BEARING CREDENTIAL ON THIS ROW because 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 for a sprinkler-system backflow assembly. 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 - runs 718/730/731/739 treatment.

AWWA (standard issuer; no certificate published) Printed verbatim on ES-957RPDA, prefix and number both legible, including the -97 edition suffix. AWWA C511 is one of the four standards IPC 2021 Table 608.1 names for this device class.

NONE RECORDED AS AN EXPRESS NEGATIVE. ASSE 1013 is the reduced pressure principle backflow preventer standard, it is the FIRST standard named in the IPC 2021 Table 608.1 row for this device class, and it is the FIRST standard named in UFGS 21 13 13 paragraph 2.5. It does not appear on the engineering specification for this model. It is not supplied by us.

NONE *** THE SHARPEST FACT ON THIS ROW AND THE LEAD OF LETTER 141. UL/FM is what distinguishes a backflow assembly acceptable on a fire service line from a potable-water one, and UFGS 21 13 13 paragraph 2.5 requires the assembly to be listed for fire protection use. THE 957RPDA IS THE WATTS PRODUCT WHOSE ENTIRE PURPOSE IS FIRE SERVICE - its own sheet says the bypass meter detects theft from the fire sprinkler system - AND ITS SHEET CARRIES THE WEAKER PUBLISHED CREDENTIAL SET OF THE TWO. The sibling ES-957 prints UL Classified and FM Approved; this one prints neither. NOT BORROWED ACROSS - the r730/732/736/739 sibling-sheet refusal and the r1060 Oshkosh NFPA 80 precedent both forbid it. This is a publishing gap, not a finding about the hardware, and one email settles it.

NONE The other two standards in the IPC 2021 Table 608.1 row. Neither appears on ES-957RPDA. Not supplied by us.

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. Recorded because a published, first-party BIM family is the differentiator this project competes on - the scraped competitor catalogue carries one for 2.1 percent of its rows.
Express_negatives: ASSE 1013, ASSE 1015, AWWA M14, CSA B64.4, CSA B64.4.1, UL and FM are ALL ABSENT from every 957RPDA document retrieved. Each absence is recorded rather than filled.
Transcription_caveat: ES-957RPDA prints no form/revision number in the transcribed text; the manufacturer own product page links it as es-957rpda-2423.pdf and the sibling sheet prints ES-957 2423, so the 2423 revision batch is inferred FROM THE FILENAME AND THE SIBLING, NOT READ OFF THIS DOCUMENT. Recorded as an inference, not as a printed fact.

Attributes — product claims, not third-party certifications

reduced pressure detector assemblybackflow preventerfire sprinkler servicemetered bypass304 stainless steelflood sensorgroove endhealth hazardRevit 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 the potable supply at a fire sprinkler system connection, health hazard (high hazard) applicationdetection of leakage or unauthorised water use on a fire protection system via the metered bypass