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Backflow Preventers

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Printable Spec Sheet

Installation Notes

Technical Notes

2006 Price Guide

Woodford Reps

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 37H Series
37HA 37HD1 37HD2 37HF

37HD1 and 37HD2

NidelÒ Model 37HD1/37HD2 hose connection backflow preventer is designed to protect hose connections from backflow contamination for freezing and non-freezing conditions. Manual draining is required and provides easy, sure drainage during freezing weather. Uses include outside hose bibbs, wash racks, dairy barns and swimming pool areas.

Made in the U.S.A.
Vacuum Breaker Drawing

Typical application for Hose connection Backflow Preventer

SPECIFICATIONS
HOSE CONNECTION BACKFLOW PREVENTER – NidelÒ Model 37HD1/37HD2 w/ ¾" male hose thread. ASSE 1052 approved. * IAPMO Listed * Field Testable. (see instruction sheet) * Two check valves. * Non removable * No splashback when shut off with pressurized hose.
EXTERIOR FINISH: Brass. Optional chrome plated
CONSTRUCTION - Brass and stainless steel
CHECK VALVES - Molded rubber diaphragms
NON-REMOVABLE - Bushing attached with LOCTITEÒ
THEFT RESISTANT - Stainless steel stop collar and stop screw. (Model 37HD2)
INLET - ¾ inch female hose thread
MAX PRESSURE - 125psi MAX TEMP. - 120° F
Complete Assembly Finish
37HD1-BR Brass
37HD1-CH Chrome
37HD2-BR Brass
37HD2-CH Chrome

PATENTS - This product may be manufactured under one or more of the following patents: U.S. Patents: 3,414,001; 4,178,956; 4,316,481; 4,532,954; D216,790; D216,791; D277, 366. Canada Patents: 852,529; 865,995; 1,146,438.

This product is tested and listed to an ASSE standard. The standard states that this product is not intended to be used for continuous use
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