# Backflow Prev Plumb — ASSE/CSA Selector

> ASSE/CSA Selector (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/backflow-prev-plumb/id6765783890 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 33 MB
- Languages: English
- Released: 2026-05-04
- Data updated: 2026-06-25
- User reviews in markdown: https://appshunter.io/ios/app/backflow-prev-plumb/id6765783890/reviews.md

## What is Backflow Prev Plumb?

Backflow Prevention Device Selector is a professional plumbing calculator and reference tool for master plumbers, backflow prevention testers, water utility inspectors, and building code officials. Select the correct ASSE-certified backflow prevention device for any application in seconds, with full hazard classification and IPC/UPC code compliance verification. Works 100% offline on the job site with zero internet dependency - designed for water safety compliance.

FEATURES
- Device Selection by Application: 17 application types — irrigation, boiler (with and without chemical treatment), fire protection, laboratory, medical/dental equipment, chemical feed, commercial laundry, food processing, pool/spa, solar heating, carbonator/beverage dispenser, hose connection, toilet and urinal flush valves, commercial dishwasher, and cooling tower
- 8 Backflow Device Types: Atmospheric Vacuum Breaker (AVB), Hose Vacuum Breaker (HVB), Spill-Resistant Vacuum Breaker (SVB), Double Check Valve Assembly (DCVA), Pressure Vacuum Breaker (PVB), Reduced Pressure Principle Device (RPZ), Anti-Siphon Device (AG), and Dual Check Valve
- Hazard Classification: Automatic high vs. low hazard classification for each application type to ensure correct protection level
- Standards Reference: ASSE 1001 (AVB), 1011 (hose vacuum breaker), 1013 (RPZ), 1015 (DCVA), 1020 (PVB), 1024 (dual check), 1056 (SVB) and ASME A112.1.2 (air gap)
- Ranked Recommendations: Devices ranked by preference and code compliance for your specific application
- Pressure and Temperature Requirements: Verify device pressure and temperature compatibility for your specific installation
- Installation Notes: Code-specific installation requirements and location constraints for each device type

HOW IT WORKS
1. Select your application type from the dropdown (irrigation, boiler, fire protection, etc.)
2. The app automatically classifies the hazard level (high or low)
3. View all compatible backflow prevention devices ranked by preference
4. See ASSE standard references and full device specifications
5. Save calculations to history, export to PDF for code inspections and permits

PERFECT FOR
- Master plumbers and journeyman plumbers performing backflow prevention installations
- Backflow prevention testers and cross-connection control specialists
- Water utility inspectors verifying compliance with code standards
- Plumbing contractors and mechanical estimators
- Building code officials and inspectors
- Plumbing apprentices learning ASSE standards and device selection

OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
• Unlimited saved calculation history
• PDF export of results
• Dark theme
• Ad-free experience

STANDARDS & COMPLIANCE
ASSE 1001 Atmospheric Vacuum Breaker, ASSE 1011 Hose Connection Vacuum Breaker, ASSE 1013 Reduced Pressure Principle Assembly, ASSE 1015 Double Check Valve Assembly, ASSE 1020 Pressure Vacuum Breaker, ASSE 1024 Dual Check Valve, ASSE 1056 Spill-Resistant Vacuum Breaker, and ASME A112.1.2 Air Gap. Also references IPC (International Plumbing Code) and UPC (Uniform Plumbing Code) cross-connection control requirements. Always confirm with your local code official and water purveyor.

OFFLINE & PRIVACY
- Works 100% offline - no internet required on the job site
- No account needed - instant access without signup
- No data collection or cloud sync - all calculations stored locally on your device
- No tracking or analytics - your work stays completely private

Part of PlumbTools Suite - professional plumbing calculators and code reference tools for plumbers, pipefitters, and plumbing contractors. Reduce calculation errors, ensure code compliance, and work faster in the field with plumbing code calculators.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |



## Version history (last 3 releases)

### 1.0.5 — 2026-06-12

What's new:
- Corrected standards: air gap is ASME A112.1.2; hose connection vacuum breaker is ASSE 1011
- Safety: solar heating (glycol) and toilet/urinal flush valves are now high hazard; DCVA removed where not legal
- New application: Boiler with chemical treatment (RPZ)

### 1.0.4 — 2026-05-18

What's new:
- Updated metadata for clarity per App Store guidelines
- Optional Pro upgrade is a separate one-time in-app purchase (not required for calculator features)

### 1.0.3 — 2026-05-04

No release notes.

## More apps by Rizvan Adzhoian

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- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*