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1/2' 9D-M3 Backflow Preventer Brass Dual Check Valve with Intermediate Atmospheric Vent,1/2 Inch,Female Union Inlet and Outlet,190T012,Replacement for Watts

4.8 (7) Write Review

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$69.99

$ 33 .99 $33.99

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About this item

Versatility: The dual check valve is designed for smaller supply lines, ideally for laboratory equipment, processing tanks, sterilizers, dairy equipment and similar applications. It is especially recommended for boiler feed lines to prevent the return pressure from being lower than the system pressure during supply.Compatible with all major brands.
Product Parameter: Series 9D is suitable for use on hot or cold water and can be used under continuous pressure.Temperature range: 33°F – 210°F. Maximum Working Pressure:175psi (12.1 bar). Minimum Required Pressure: 25psi (1.7 bar).Inlet & Outlet connection size 1/2 IN, Thread Type NPT.
Qualitative Materials: Backflow preventer construction consists of brass body, stainless steel working parts, integral filter and durable rubber disc. The inlet and outlet of the inner connector are connected. Main check valve with rubber disc seat combined with matching rubber parts to ensure tight closing.
Notice: To avoid water damage from valve operation, a drain pipe must be installed, which should terminate about 12 inches above the floor drain. If used on a boiler, do not use an air gap joint on the surface to prevent scalded water or base steam from causing personal injury. Exhaust ports or discharge lines should not be blocked under any circumstances.
Satisfactory Service: Your satisfaction is always our persistent pursuit, if you have any questions in the use of products, you can always communicate with us, looking forward to serving you.

Product Description

Usage Scenarios

Boiler Feed Pipe

Dairy Equipment

Sterilizer

Plumbing

1/2" F9D-M3 Backflow Preventer Brass Dual Check Valve

Jimmy

Reviewed in the United States on March 10, 2025

Easy installation and works perfectly.

PugMomof3

Reviewed in the United States on January 25, 2025

way better quality than all the cheap junk fittings and plumbing stuff I'm typically seeing on amazon.

Online Consumer

Reviewed in the United States on December 6, 2024

I added this to my yard pump in a shallow well that only feeds the garden. I probably could have got one without the overpressure vent, but I do like that this keeps the prime on the system, there's also a foot valve but I don't rely on those necessarily. This means I can water the garden from the yard well without having to reprime it, and I'm not worried about the water in the system draining back down into the well.

dan

Reviewed in the United States on December 31, 2024

This was ordered to satisfy code requiring backflow prevention between the copper house water lines and an outdoor PVC sprinkler system. The existing connection had two serial soldered-in shut-off valves, but there was no check valve/backflow prevention and one of the shutoff valves (a ball valve) had developed a slight leak through its stem.This heavy duty brass backflow preventer bot only satisfied the need for serial backflow prevention, but the build-in pipe threaded brass unions made installation fast and easy- plus any future maintenance will be easy now.Summary- this is a very high quality well built brass valve with matching heavy duty pipe threaded union connections.

Starman

Reviewed in the United States on December 20, 2024

Good price. Well made of brassBut threads are tight.as well as the thick washers

Captain Jim

Reviewed in the United States on November 27, 2024

I searched Amazon for Watts D9-M3, this came up looking exactly like the Watts unit I need to replace. Foolishly I didn’t look carefully enough to realize it’s a Chinese knock-off. Actually a very nice looking one. But it’s getting returned in favor of the real thing, US built and perhaps longer lasting.

uncle d

Reviewed in the United States on November 15, 2024

the description says "replacement for Watts" but as far as i can tell this doesn't have the same product approvals. i received a dual-check valve with average fit & finish. the valve has gasket unions for 1/2NPT on the inlet and outlet, and a simple threaded outlet on the vent. the information plate on the valve indicates 210F max temperature & 175 PSI max pressure, and notes a model number of 190T012, not the expected "F9D-M3" — i have no idea whats up with that.the valve appears fit in the space where my watts valve is, but the information sticker on the old Watts valve says "ASSE 1012", "NYC BSA 104-75-SM" and "CSA B64" on it; there's no mention of any approvals on the new valve. i don't feel confident installing a device like this without the appropriate approval mark.

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