SRX 1.75” OD Bottom Loading Remediation Pump

SRX-R Pneumatic pumps for use in 2-inch and larger-diameter wells up to 200 ft.

The SRX is an air-powered pump used to extract ground water or total fluids at variable rates equal to the well recharge rates. The SRX is 1.75in (45mm) OD for use in 2” (50mm) wells. Pump flow rates are up to 2.3 gpm (8.7 lpm). The SRX pump is available in top loading for recovering total fluids or bottom loading for dissolved phase and higher pumping rates Reliability and effortless maintenance. It is so simple that, in minutes, the complete pump (including air, exhaust and fluid discharge check valves) can be disassembled with only one wrench.

Add to Request
SKU: DUR TR-977 SRX-R BL Categories: , Tag:

Loading Configurations
Top-loading pumps are selected for pumping total fluids (LNAPL and ground water simultaneously). Water table draw-down will be maintained at a level corresponding to the top inlet of the pump. Pumps of shorter lengths are available for lower draw-down requirements.

Bottom-loading pumps are selected for dissolved phase or DNAPL applications. When installing the pump, the head is positioned at the depth of the desired water table depression.

1. Advanced, positive-sealing air valves with built-in filtration
2. Complete disassembly with only one wrench
3. Constructed with durable materials such as stainless steel, brass, Buna-N®, Nylon® and Viton®
4. Durable Ebonite float
5. Light weight


The SRX is installed to the desired draw-down level. It requires only three lines: air supply, air exhaust and fluid discharge. Compressed air is supplied to the pump (generally 0.5 psi per foot of depth is sufficient).

As the liquid enters the pump, the internal float moves to the upper (or “ON”) position. At that end point, the float opens the air valve. Air enters the pump, closes the bottom inlet check valve, and pushes the fluid (in the pump chamber) through the centre discharge tube and all the way to the surface.

As the fluid is expelled from the vessel, the float returns to the lower limit (or “OFF” position) at which point it closes the air inlet valve and opens the air exhaust valve. As the pump fills under the fluid’s own static pressure, air is vented through the exhaust port and the cycle is automatically repeated based on the well recharge rate.

Pump Construction
Stainless steel, Type 304: Pump body, discharge tube
Stainless steel, Type 303: Pump head, bottom intake valve, assembly control rod, control linkage assembly Brass: Hose and tubing barbs
Hydlar (Nylon/Kevlar® composite): Control rod bushing
Nylon®: Discharge and top-loading check valve ball
Buna-N®: Bottom intake check valve ball
Viton C: O-ring seals, air inlet ball valve
Ebonite (expanded Buna-N®): Float
Neodymium Iron: Magnets
Top intake casting: Red brass

Air Valve Design — The advanced air valve design provides a leak-tight seal. This is accomplished with a special Viton® ball on a stainless steel seat . The positive seal eliminates air leakage that can increase the formation of precipitates at the pump head. Assisted by an isolated magnet, the valve shifts positively, — every time. This prevents stalling even in slow-filling situations. No adjustments are necessary with this valve assembly.

Air Valve Filtration — The air valve incorporates 330-mesh stainless steel screens to prevent debris from entering the ball/seat sealing assembly, possibly causing the valve to malfunction. On other pumps, when the air supply to the pump is turned off, the float will activate the air valve and create a pathway through which debris may enter the air valve and interfere with the proper seating of the ball. This is not a concern with the SRX pump. Please note the two inch pump only has an air inlet filter assembly.

Easy Access — To make routine maintenance easier, the air and exhaust valves on the SRX can be accessed from the top of the pump without disassembling the body. In addition, the internal valve assemblies can be accessed for cleaning by simply removing the hose fittings.

Lightweight Control Rod — The lightweight control rod is a primary reason why the SRX does not stall. Less weight translates into less force that is required to open the air valve. This ensures a quick, positive opening every time. The control rod is isolated from the energy that is created by the float movement, therefore eliminating any stress on the rod.

Pump Disassembly — The SRX pump is designed to be completely disassembled with just one wrench. Remove the bolts from the bottom assembly, slide the body off and remove two cotter pins to fully disassemble the pump. Simple!

Screen Inlet — For cleaning bottom- loading pumps, the screen is easily removed by unthreading a single bolt. To protect the screen from collapse, the screen assembly is supported by the arch at the bottom of the pump. A threaded inlet screen is standard on all top-loading pumps to limit debris from entering the top inlet.

Pump OD: 1.75 in (45mm)
Pump Length: 44 in (112mm)
Vol. per. Cycle: 0.12 US gal (0.45 litres)
Min. Submergence: 29.3 in (750mm)
Pump Weight: 4.0 lb (1.8kg)
Max. Flow Rate: 2.3 gpm (8.7 lpm)
Air Valve Filtration: Yes

Ordering Information:

TR-977 SRX-R 1.75” OD Bottom Loading Configuration

Custom sizes available




Weight 15 kg
Scroll to Top