Backflow Prevention That Actually Works.
WaStop® Inline Check Valve · Membrane Technology
100%
Backflow prevention
Moving Parts
20+
Typical Install time
Same-Week Demo Scheduling
No Purchase Obligation
Your Data Stays Private
Why WaStop®
A Smarter Approach to Flood & Backflow Control
Traditional flap gates leak, jam, and corrode. WaStop’s patented membrane technology eliminates every one of those failure points — permanently.
No Leakage — Ever
WaStop's Memory Membrane creates a complete hydraulic seal. Unlike flap gates that leak from day one, WaStop prevents 100% backflow — independently verified and CE-certified.
No Power Required
Fully autonomous differential pressure operation — no electricity, no control systems, no human activation. It just works, even during storm events when power may fail.
No Routine Maintenance
The pulsating flow mechanism self-cleans the valve with every cycle, flushing debris upstream and downstream. Fewer maintenance visits mean lower total cost of ownership.
Inline Installation
WaStop inserts directly into existing pipes — no chambers, no excavation, no structural modifications. Retrofit or new construction, horizontal or vertical mounting.
Debris Tolerant
The flexible membrane seals around rags, cans, and solids — then flushes clear. No debris lodges in the seat, unlike duckbill or flap gate alternatives.
Any Pipe, Any Size
Available from NPS 3" to NPS 84" (DN75–DN2000), fitting virtually any municipal or industrial pipe. Adaptable to concrete, PVC, HDPE, and steel pipe types.
WaStop® Inline Check Valve System
The lowest headloss on the market. 100% backflow prevention. Self-cleaning pulsating flow. WaStop has been the inline check valve standard since 2000 — trusted in stormwater, combined sewer, coastal, and industrial applications worldwide.
- Patented Memory Membrane — exceptional shape retention and chemical resistance for 20+ year service life
- Lowest headloss on the market — reduces upstream flooding risk from system resistance
- Self-activating on differential pressure — no sensors, no actuators, no power supply needed
- Pulsating flow mechanism keeps pipes clean upstream and downstream, cutting maintenance costs
- Blocks odours and pests in combined and sanitary sewer applications
- ISO 9001:2015 and ISO 14001:2015 certified; CE tested to EN 13564-1
- Compatible with FEMA BRIC, FMA, and SRF funding programs
Available Pipe Sizes:
Applications
Built for Real Infrastructure Challenges
WaStop solves backflow and flood problems that traditional check valves and flap gates can’t reliably handle.
Stormwater Outfalls
Prevent tidal and surge backflow into stormwater networks with a maintenance-free, self-sealing solution that performs on every storm event.
Combined Sewer Overflows
Block backflow and sewer odour in CSO systems. WaStop's seal prevents gas migration while allowing normal forward flow without restriction.
Flood-Prone Municipal Systems
Protect upstream catchment infrastructure from downstream surges. Autonomous operation means zero reliance on human response during emergencies.
Coastal & Tidal Infrastructure
Designed for bidirectional tidal environments. WaStop can be oriented for both forward and reverse protection in sea outfall applications.
Retrofit Existing Pipes
No need to demolish or replace pipe sections. WaStop slides into existing infrastructure in under an hour — new construction or existing systems.
Industrial Discharge Control
Prevent contaminated backflow into process water or surface water sources. Chemically resistant membrane handles aggressive flows.
Does This Sound Familiar?
Why Engineers Specify WaStop
If any of these resonate with your current infrastructure or project challenges, it's worth a conversation.
Your flap gates leak at low head
CFlap gates tolerate leakage by design. Even a small gap allows consistent backflow under tidal pressure. WaStop seals at zero differential head.
Debris keeps jamming your valves
Rags, solids, and debris lodge in flap gate hinges and duckbill seals — and stay there. WaStop's pulsating action flushes everything clear automatically.
Maintenance access is difficult or expensive
Confined space entry, shoreline access, and dive inspections are costly and hazardous. WaStop's design minimizes inspection and service frequency dramatically.
Your headloss calculations assume a leaky valve
If your hydraulic model accounts for flap gate leakage, you're designing to failure. WaStop eliminates that assumption — improving model accuracy and reducing flood risk.
Lifecycle costs keep climbing
Replacement parts, servicing, and repeated mobilizations add up. WaStop's 20+ year membrane life and zero-maintenance design change the total cost picture entirely.
You're trying to qualify for resilience funding
FEMA BRIC, FMA, and SRF programs reward durable, low-maintenance resilience solutions. WaStop's track record and CE certification support specifications and grant applications.
The Process
What to Expect
A project review is low-pressure and practical — designed to give your team real answers, not a sales pitch.
Submit Your Project
Fill in the form with your project details and application type. We'll respond within one business day.
We Prepare
Our specialist assesses your pipe sizes, flow conditions, and site constraints to identify the right WaStop configuration.
Technical Consultation
We walk through product specs, hydraulic data, installation requirements, and lifecycle cost comparisons with your engineering team.
Specify & Deploy
We support your spec writing, contractor coordination, and product delivery. Fast-track shipping available on standard sizes.
Get Started
See WaStop® Applied to Your Project
We’ll review your application, recommend the right product configuration, and provide hydraulic and lifecycle cost data to support your decision.
Request Your Free Demo
Takes less than 2 minutes. We'll handle the rest.
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