Source: Title: Backflow Prevention \| How Drinking Water Gets Protected Content revision: 735eedece33783d06ef9602a34385bf838e49aa9357fc3564faf033b26160aba Source modified (WordPress record): 2026-09-10T12:27:17+00:00 Extracted at: 2026-10-25T18:21:36+00:00 Freshness: Stored anonymous publication. Refreshed in the background after content changes and daily; the previous successful version remains available during refresh. See extracted-at time. Live inventory requires its tool. ## Relevant next steps This page has no currently verified direct booking-service mapping. Choose an actual service or ask the office; do not infer a service ID from the page title. - [Choose a booking service and check coverage](https://mtnmanplumbing.com/?agentnet=task&agentnet_tool=get_booking_services&agentnet_display=raw) — get_booking_services - [Ask the office about this page](https://mtnmanplumbing.com/?agentnet=task&agentnet_tool=submit_contact&agentnet_display=raw) — submit_contact; needs: request_id, name, message, user_confirmed ## On this page - [Menu]() - [Two checks.One intended direction.]() - [2. Water tries to return]() - [Forward pressure opens both checks.]() - [The body holds the working parts.]() - [Same purpose.Different mechanisms.]() - [Device problem?Tell us what you have.]() - [Need a certified test?]() - [What does theprice cover?]() - [Two water supplies at one property.]() - [Keep following the plumbing.]() - [Exclusive Offers]() - [Let’s getit fixed.]() - [Accessibility Tools]() - [Our Name Is On ItMountain Man ↗]() - [Our Name Is On It]() Browser controls omitted; use the source page for interactive features. MOUNTAIN MAN RADIO 15 originals · All Mountain Man [Skip to content]() [Mountain Man Plumbing home]() - [Call / text **(385) 766-8935**]() - [**Book now**]() ### Menu - ### Services ⌄ Mountain Man Plumbing ## What can we fix? 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One direction. # Backflow prevention. *See what protects your water.* **Backflow** is water moving backward toward the drinking-water supply. A drop in supply pressure can pull water back from a connected hose or system. Higher pressure on the equipment side can push it back. Backflow protection interrupts these paths before used water reaches the drinking supply. **Device service and plumbing connections.** Testable RP/RPZ and vacuum-breaker assemblies go to a backflow specialist. We do not perform certified backflow testing. [Service or a required test? ↓]() Long story short A backflow notice should name the assembly and the testing requirement. Have that notice available when you call. This guide explains what the device protects, how to find the responsible water provider and when a certified tester or repair is needed. Jump to: [Two checks. One intended direction]() · [Same purpose. Different mechanisms]() · [Device problem? Tell us what you have]() Skip the read? [Book a visit]() or [text (385) 766-8935](). 01 / Explore a mechanical backflow device ## Two checks. *One intended direction.* A **check valve** is an automatic one-way valve. A **dual-check device** has two in a row. Rotate this 3D cutaway, change the flow condition, and inspect the parts. ### 2. Water tries to return ### 1. Water flows forward The 3D cutaway loads here. The part explanations below also work without 3D. Drag to rotate · Select a part below · Teal arrows show forward flow; orange shows attempted return flow. ### Forward pressure opens both checks. Forward water pressure pushes each disc away from the ring it seals against, called the seat. The springs compress and water passes through both checks. ### The body holds the working parts. The housing contains the water passage and both checks. Open the cutaway to see how the discs, seats and springs fit inside it. ### The first check is nearest the supply. It opens toward the equipment when forward pressure is sufficient. Its spring returns the sealing disc to its seat when forward flow stops. ### The second check adds another closure. The second check has its own spring and sealing surface. It closes independently, providing another barrier to backward flow. ### The seal meets the seat. The dark sealing disc closes against a fixed ring called the seat. Debris or wear can keep that contact from sealing correctly, even when the outside looks fine. ### Springs return the checks to closed. Forward flow compresses each spring as the disc opens. When flow stops, the spring moves the disc back onto its seat. Pressure trying to push water backward also presses the disc against its seat. This compact dual check is for **non-health-hazard applications**: return water could affect taste or appearance but would not introduce a health hazard. A connection exposed to chemicals or contaminated water needs protection rated for that hazard. [Watts LF7 reference ↗]() 02 / Learn the device names ## Same purpose. *Different mechanisms.* ### Vented dual checks A vented dual check adds an atmospheric opening between its two checks. The Watts 9D is a non-health-hazard device used on suitable boiler fill connections. The boiler’s fluid, including any additives, affects the protection that connection needs. [See the device & its limits ↗]() ### RP / RPZ assemblies These names refer to reduced-pressure backflow assemblies. They combine two checks with a pressure-operated relief valve between them. They have test connections and protect against both a backward push and a backward pull when correctly selected and installed. [See an RP assembly ↗]() ### Vacuum breakers These admit air to interrupt a backward pull, called **backsiphonage**. Atmospheric and pressure vacuum breakers do not protect against **backpressure**—a push from the other side. The exact type determines its placement, pressure, and testing requirements. [See a pressure vacuum breaker ↗]() An **air gap** protects a supply through physical separation. Mechanical devices use internal components to control reverse flow. Identify the installed protection and the hazard it serves before selecting parts or a replacement. 03 / Find service or a certified tester ## Device problem? *Tell us what you have.* We work on non-testable backflow devices and their plumbing connections. Send the make, model and a photo of the connection when arranging service. Testable reduced-pressure assemblies (RP/RPZ) and vacuum-breaker assemblies go to a backflow specialist. - [Discuss backflow service: (385) 766-8935]() - [Explore boiler systems ↗]() ### Need a certified test? **We do not perform certified backflow assembly testing.** Your water provider can tell you when your assembly needs a test, including after repairs, and how the results must be submitted. Use a currently certified Utah Backflow Assembly Tester for that work. - [Find a Utah certified tester ↗]() - [Utah testing guidance ↗]() Further reading: [Utah Backflow 101]() · [EPA cross-connection manual]() · [All plumbing services](). The price, in plain terms ## What does the price cover? 1. 01 **Name the work.** What's being repaired or installed, and what stays. 2. 02 **Check what's included.** Parts, labor, access, cleanup and any required permit. 3. 03 **Settle the open questions.** Extra work, exclusions and the warranty for this job. A quote for backflow work should make the scope clear. Check who handles access and patching, whether any further diagnosis costs extra, and what happens if opening things up reveals more damage. **Found a lower number? Ask us why ours is different.** Bring both descriptions of the work. Compare the equipment, repair scope and exclusions before deciding what the difference buys. A higher price alone doesn't prove a better job. - [**Utah plumbing price guides ↗** What changes the cost and what to ask before agreeing. On Utah Plumbing Prices, which we publish.]() - [**Already have a quote? Check it ↗** Use our second-opinion tool to work through the job and the price you've been given.]() - [**How plumbing pricing works ↗** Flat rate, hourly, dispatch fees, permits: what each one means for what you pay.]() From our local guides ## Two water supplies at one property. The city guides explain local irrigation systems and cross-connections. Our backflow guide separates device service from certified testing. - [**South Jordan: keeping the supplies separate ↗**]() - [**Herriman: the cross-connection incident ↗**]() - [**Lehi: what the second water system does ↗**]() - [Find plumbing help in your city ↗]() - [Explore this topic across our service area ↗]() Connected in your home ## Keep following the plumbing. - [01 **Outdoor faucets & hose bibs →** See why an outdoor faucet needs protection at its hose connection.]() - [02 **Appliance & laundry plumbing →** Follow protected drain connections for laundry and kitchen equipment.]() - [03 **Water shutoff valves →** Locate the valves used to isolate a water connection for service.]() ### Exclusive Offers ● Active Specials Mountain Man Plumbing deals and offers [Skip to Footer]() Mountain Man Plumbing Sandy, Utah · Salt Lake Valley [Mountain Man Plumbing logo]() Your local plumber ## Let’s get it fixed. Strong values. Reliable service. 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