Picture this: your deep well pump is cycling on and off far more often than it should, and every time it shuts down, you hear a loud thud from the pipeline. That is the classic sign of a missing or failing check valve. The right check valve for deep well pump setups keeps water flowing in one direction and protects your entire system from damaging pressure spikes.
A check valve is a small but critical component. It prevents water from flowing backward when the pump shuts off, which protects the pump, pipes, and pressure tank. If you have ever experienced a sudden thump in your plumbing, you know how disruptive water hammer can be.
In this review, we focus on the Wassermann 1-1/4″ Brass Check valve 1.25“ NPT, a 1.25-inch NPT valve designed for submersible well pumps, irrigation systems, and general water supply lines. We will cover its key features, installation options, and where it fits into your overall setup. For help with pump sizing, see our guide on what pump you need for your well.
Pros
- Precision-machined brass body for reliable sealing and corrosion resistance
- Stainless steel spring and fasteners for long-term durability in water applications
- Compatible with standard 1-1/4 inch NPT well pump and irrigation connections
- Flexible installation orientation and clear flow arrow
- Strong customer satisfaction and dependable pressure retention
Cons
- Only available in 1-1/4 inch NPT, so other pipe sizes require adapters
- NPT threads need sealant tape or pipe dope to create a leak-free connection
- All-metal body is heavier than plastic check valves and may need support in some installations
The Wassermann 1-1/4 inch brass check valve is a spring-loaded backflow preventer built for submersible well pumps, irrigation lines, and household water supply systems. It connects with a 1.25 inch NPT inlet and a 1.25 inch FNPT outlet, making it a direct replacement for standard 1-1/4 inch well pump installations. Homeowners and contractors who want a corrosion-resistant valve will appreciate the durable all-brass body.
The valve opens automatically as water flows in the correct direction and closes quickly when flow reverses. A stainless steel spring and fasteners on the poppet help reduce water hammer, protecting the pump and downstream pipes from pressure spikes. User experiences show tight sealing and steady pressure retention, with no measurable water loss over a full week of use.
Machining accuracy and seal quality are noticeably better than typical hardware-store check valves. The brass exterior resists rust and corrosion in deep well environments, while the strong body stands up to repeated cycling. An arrow on the valve clearly marks flow direction, and the design supports both horizontal and vertical installation.
The main limitation is the fixed 1-1/4 inch NPT size, so other pipe diameters need adapters. Installers should use thread sealant tape or pipe dope on NPT threads to avoid leaks, and the all-metal construction is heavier than plastic valves, which may require extra support in certain layouts.
Overall, this is a dependable upgrade for well pump and water system owners who need reliable backflow prevention. Solid materials, precise machining, and strong sealing performance make it a smart choice for 1.25 inch NPT systems. For long-term durability and peace of mind, the Wassermann brass check valve delivers.
Buying Guide: Choosing a Check Valve for Deep Well Pump Systems
Connection Size and Thread Type
The Wassermann valve uses a 1.25-inch NPT male inlet and a 1.25-inch FNPT female outlet. That means the valve threads directly onto the discharge pipe of a standard 1-1/4 inch submersible well pump. Most residential deep well pumps of this size use NPT threads, so the fit is straightforward.
Before purchase, check whether your pump outlet is male or female. In some cases, you may need a nipple or adapter. The Wassermann valve is designed to simplify that connection, but measuring your pipe diameter is always the smart first step.
If you are also considering a complete pump package, our well pump kit with pressure tank guide can help you see what else is involved.
Material and Build Quality
A check valve for a deep well pump sits in a demanding environment. It handles high pressure, temperature changes, and sometimes aggressive water chemistry. The Wassermann valve uses a solid brass body, which resists corrosion far better than lower-cost plastics.
Inside, a stainless steel spring and stainless fasteners keep the poppet moving smoothly. That matters because a stuck poppet can leave your check valve open or closed at the wrong time. The stainless components also hold up when the valve is installed in a well pit.
If you are putting together a full system, our well pump kit buying guide covers the other parts you will need.
Spring-Loaded Design and Water Hammer Resistance
Water hammer is the shock wave created when a column of moving water stops suddenly. A check valve that slams shut can actually make the problem worse. The Wassermann valve uses a spring-loaded poppet that closes decisively but with some control, reducing the force of the slam.
This design is especially useful for submersible well pumps, which often cycle on and off automatically. Over time, repeated water hammer can loosen fittings and shorten pump life. A spring-loaded valve is a simple way to add protection.
For a quieter overall water system, you may also want to check our quiet well pump recommendations.
Installation Flexibility and Flow Direction
One of the standout features of the Wassermann 1-1/4″ Brass Check valve 1.25“ NPT is that it can be installed horizontally or vertically. That gives you more freedom in confined spaces, such as a well pit or utility closet.
The valve body includes an arrow that indicates the correct direction of flow. Install it the wrong way and the valve will block water entirely or fail to close. Paying attention to that arrow is the single most important step during installation.
You can also mount the valve near the pressure tank or directly below the pump, depending on your system design. Either way, the NPT threads make a secure mechanical connection.
Final Thoughts
For most deep well pump installations, the Wassermann 1-1/4″ Brass Check valve 1.25“ NPT is our top pick. If you need the same level of protection for an irrigation or general water supply system, the Wassermann 1-1/4″ Brass Check valve 1.25“ NPT is equally capable, offering flexible installation and a corrosion-resistant brass body.
Frequently Asked Questions
What size check valve do I need for my deep well pump?
Most submersible well pumps in this range use a 1.25-inch NPT connection. The Wassermann valve matches this exactly. To confirm your size, measure the outer diameter of the pipe and check your pump’s spec sheet. For more on matching pumps to pressure tanks, see our guide on well pump for pressure tank.
How does a check valve prevent water hammer?
When the pump shuts off, water in the column above the pump tries to flow backward. A check valve closes immediately, stopping that reverse flow. In the Wassermann valve, a spring-loaded poppet closes before the water can gain momentum, which reduces the pressure spike. This protects fittings and the pump itself.
Can I install a check valve horizontally in my well pump system?
Yes. The Wassermann 1-1/4″ Brass Check valve 1.25“ NPT can be mounted horizontally or vertically. The arrow on the body shows the flow direction. In a horizontal installation, placing the valve with the cap facing upward can help ensure smooth operation in some systems.
Do I need a check valve if I already have a foot valve?
If you already have a foot valve, you might think a check valve is redundant. However, many deep well systems use both. A foot valve keeps the pump primed, while a check valve near the pump protects against pressure spikes and backflow. In 2026, most installers recommend stacking this protection for the most reliable setup.
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