The EZ-FLO Coupler with Ball Valve (PVC Slip) is the essential installation fitting for connecting an EZ-FLO fertilizer injector directly into a PVC mainline irrigation system. With socket-by-socket (slip) connections that glue into standard PVC pipe, this coupler creates a permanent inline installation point for your EZ-FLO fertigation unit — ideal for multi-zone drip systems, landscape mainlines, and commercial growing operations. The built-in ball valve is a critical feature: it allows you to partially restrict flow through the mainline, creating the pressure differential needed to draw fertilizer from the injector tank across a wide range of system flow rates.
Manufactured from durable Schedule 40 PVC, this coupler features two 1/4" 304 stainless steel barbed tubing fittings that connect directly to the flexible tubing supplied with every EZ-FLO injector system. The normal minimum water flow required to operate an EZ-FLO injector is 120 GPH; however, by partially closing this coupler's ball valve, you can force more water through the injector and operate at lower flow rates. This coupler can be installed before or after your zone valve. Available in multiple PVC pipe sizes — select the size that matches your mainline at checkout.
Key specifications for system planning and compatibility.
| Specification | Details |
|---|---|
| Connection Type | Socket × Socket (PVC Slip — glue-in) |
| Available Pipe Sizes | 3/4" to 4" (select at checkout) |
| Body Material | Schedule 40 PVC |
| Tubing Barb Ports | Two 1/4" — 304 Stainless Steel |
| Ball Valve Included | Yes — for differential pressure adjustment |
| Minimum Flow (Standard) | 120 GPH (adjustable via ball valve) |
| Installation Position | Before or after zone valve |
| Compatible With | All EZ-FLO mainline fertilizer injector units |
| Brand | EZ-FLO |
Step 1: Turn Off Your Water Supply
Shut off the water to the mainline section where you will be installing the coupler. Drain the line before cutting.
Step 2: Cut the PVC Mainline
Using a PVC pipe cutter, cut out a section of your mainline pipe equal to the length of the coupler body to create room for the inline fitting.
Step 3: Glue the Coupler Into the Line
Apply PVC primer and cement to the pipe ends and the coupler sockets. Insert the coupler with the ball valve handle oriented for easy access. Hold firmly for 30 seconds and allow to cure before pressurizing.
Step 4: Connect the Injector Tubing
Attach the 1/4" flexible tubing from your EZ-FLO injector to the two stainless steel barbed ports on the coupler — one tube to the inlet port (from the injector outlet) and one to the outlet port (returning water from the injector to the line). If system pressure exceeds 50 PSI, secure with tubing clamps.
Step 5: Calibrate the Ball Valve
Restore water flow. If the injector is not drawing fertilizer, gradually close the ball valve to increase the pressure differential between the two ports until the injector begins pulling solution. Higher-flow systems (spray heads, large drip zones) may not require any ball valve adjustment.
Important: All systems using a fertilizer injector must include a backflow preventer to protect your domestic water supply. Check your local codes for the required type.
What is the difference between the PVC Slip coupler and the FPT coupler?
The PVC Slip (socket) coupler uses solvent-weld (glue) connections and is designed for permanent installation directly into a PVC mainline pipe. The FPT version uses female pipe threads (NPT) and is intended for threaded connections into copper, steel, HDPE, or other threaded pipe materials.
Why isn't my EZ-FLO injector drawing fertilizer after installation?
If the injector is not pulling solution, the pressure differential between the two coupler ports is likely insufficient. Gradually close the ball valve on the coupler to restrict mainline flow and increase the differential pressure until the injector begins drawing.
Can this coupler be used with any EZ-FLO injector unit?
Yes, this coupler is compatible with all EZ-FLO mainline fertilizer injector units. The Ball Valve coupler is especially recommended — and required — for EZ-FLO High Capacity (HC) units, and is highly recommended for any application using heavier fertilizer solutions or higher desired feed rates.
Do I need a backflow preventer when using this coupler?
Yes. Any time a fertilizer injector is connected to your irrigation system, a backflow preventer is required by plumbing codes in most areas to protect your potable water supply from fertilizer contamination.
Everything you need to build a complete EZ-FLO mainline fertigation setup:
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