Industrial Valves

Double Check Detector Assemblies

ValveMan carries double check detector assemblies that combine proven backflow prevention with the ability to detect unauthorized water usage. Built to meet industry standards, these assemblies provide both safety and accountability in water systems. With a selection of durable designs, our detector assemblies offer long-term dependability. Not sure which option is right? Reach out and we’ll help find the ideal match for your system.

Shop Double Check Detector Assemblies

All Double Check Detector Assemblies

20 products
SKU: LF757DCDA-OSY-GPM 2 1/2
2-1/2"
2-1/2" Watts LF757DCDA-OSY-GPM 2 1/2, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, OSY Gate Valve Shutoff, Gallons/Minute Meter
$12,008.00$5,851.99
SKU: LF757DCDA-OSY-GPM 4
4"
4" Watts LF757DCDA-OSY-GPM 4, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, OSY Gate Valve Shutoff, Gallons/Minute Meter
$13,581.00$6,830.99
SKU: LF757DCDA-OSY-GPM 3
3"
3" Watts LF757DCDA-OSY-GPM 3, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, OSY Gate Valve Shutoff, Gallons/Minute Meter
$12,789.00$6,331.99
SKU: LF757DCDA-OSY-GPM 6
6"
6" Watts LF757DCDA-OSY-GPM 6, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, OSY Gate Valve Shutoff, Gallons/Minute Meter
$17,633.00$9,379.99
SKU: Watts-757DCDA-OSY
2-1/2" – 10" Available
Watts 757DCDA Series, Stainless Steel, Double Check Detector Assembly Backflow Preventer, OSY Gate Valve Shutoff, Without Meter
$10,733.00Starting at $4,985.99
Browse Product
SKU: LF757DCDA-OSY-GPM 8
8"
8" Watts LF757DCDA-OSY-GPM 8, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, OSY Gate Valve Shutoff, Gallons/Minute Meter
$31,856.00$17,451.99
SKU: LF757DCDA-OSY-GPM 10
10"
10" Watts LF757DCDA-OSY-GPM 10, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, OSY Gate Valve Shutoff, Gallons/Minute Meter
$37,514.00$26,117.99
SKU: 757DCDA-OSY-LM 3
3"
3" Watts 757DCDA-OSY-LM 3, Stainless Steel, Double Check Detector Assembly Backflow Preventer, OSY Gate Valve Shutoff, Without Meter
$11,448.00$5,406.99
SKU: 757DCDA-OSY-LM 6
6"
6" Watts 757DCDA-OSY-LM 6, Stainless Steel, Double Check Detector Assembly Backflow Preventer, OSY Gate Valve Shutoff, Without Meter
$15,878.00$8,074.99
SKU: 757DCDA-OSY-LM 2 1/2
2-1/2"
2-1/2" Watts 757DCDA-OSY-LM 2 1/2, Stainless Steel, Double Check Detector Assembly Backflow Preventer, OSY Gate Valve Shutoff, Without Meter
$10,733.00$4,985.99
SKU: Watts-LF757DCDA-BFG-GPM
2-1/2" – 8" Available
Watts LF757DCDA Series, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, UL/FM Butterfly Valve Shutoffs, Gallons/Minute Meter
$9,584.00Starting at $6,672.99
Browse Product
SKU: 757DCDA-OSY-LM 4
4"
4" Watts 757DCDA-OSY-LM 4, Stainless Steel, Double Check Detector Assembly Backflow Preventer, OSY Gate Valve Shutoff, Without Meter
$12,187.00$5,845.99
SKU: 757DCDA-OSY-LM 10
10"
10" Watts 757DCDA-OSY-LM 10, Stainless Steel, Double Check Detector Assembly Backflow Preventer, OSY Gate Valve Shutoff, Without Meter
$34,025.00$22,215.99
SKU: 757DCDA-OSY-LM 8
8"
8" Watts 757DCDA-OSY-LM 8, Stainless Steel, Double Check Detector Assembly Backflow Preventer, OSY Gate Valve Shutoff, Without Meter
$28,864.00$15,157.99
SKU: LF757DCDA-BFG-GPM 3
3"
3" Watts LF757DCDA-BFG-GPM 3, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, UL/FM Butterfly Valve Shutoffs, Gallons/Minute Meter
$11,084.00$6,456.99
SKU: LF757DCDA-BFG-GPM 4
4"
4" Watts LF757DCDA-BFG-GPM 4, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, UL/FM Butterfly Valve Shutoffs, Gallons/Minute Meter
$12,305.00$6,925.99
SKU: LF757DCDA-BFG-GPM 2 1/2
2-1/2"
2-1/2" Watts LF757DCDA-BFG-GPM 2 1/2, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, UL/FM Butterfly Valve Shutoffs, Gallons/Minute Meter
$9,584.00$6,672.99
SKU: LF757DCDA-BFG-GPM 6
6"
6" Watts LF757DCDA-BFG-GPM 6, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, UL/FM Butterfly Valve Shutoffs, Gallons/Minute Meter
$16,068.00$10,413.99
SKU: 757DCDA-BFG-GPM
8"
8" Watts 757DCDA-BFG-GPM, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, UL/FM Butterfly Valve Shutoffs, Gallons/Minute Meter
$29,781.00$16,759.99
SKU: Watts-LF757DCDA-OSY
2-1/2" – 10" Available
Watts LF757DCDA Series, Lead-Free Stainless Steel, Double Check Detector Backflow Preventer Assembly, OSY Gate Valve Shutoff, Gallons/Minute Meter
$12,008.00Starting at $5,851.99
Browse Product
20+
Products Available
All 50
States Served
Net 30
Terms Available
60 Years
Valve Expertise

Why Buy Double Check Detector Assemblies From ValveMan?

Authorized Distributor Since 1965
We are an authorized distributor — not a grey market reseller. Every Double Check Detector Assemblies product ships new, with the documentation your purchasing department needs — and whatever warranty the manufacturer offers is passed through to you in full.
Expedited Options + Net 30 Terms
In a hurry? Call 888-825-8800 — depending on the item we may be able to expedite your order, and we'll tell you what's realistic. Qualified buyers can apply for Net 30 terms — ideal for MRO, OEM, and project purchasing.
Technical Support from Valve Experts
Our team has 60+ years of valve product knowledge. Call 888-825-8800 or start a chat — we'll help you select the right Double Check Detector Assemblies product for your application, pressure class, and end connection.
Need a volume quote or custom order?
Our B2B team responds within 2 hours on business days. Exton, PA — Trusted Since 1965.
888-825-8800