Installing a Simple Pump alongside an existing submersible pump in a 4-inch well requires careful consideration of space constraints. Here's what you need to know.
Space Requirements
Simple Pump Components
- Drop pipe: 1" Schedule 80 PVC (1.315" OD)
- Coupler: Slightly larger at connection points
- Lift rod: 5/16" fiberglass (passes through pipe)
4-Inch Casing Interior
- Nominal ID: 4.026" (Schedule 40)
- Actual space: Approximately 4" diameter
Compatibility Factors
Submersible Pump Size
The main variable is your submersible pump diameter:
| Submersible Size | Available Space | Simple Pump Fit |
|---|---|---|
| 3" submersible | ~1.5" | May be tight |
| 4" submersible | Minimal | Usually not compatible |
Pitless Adapter Configuration
The pitless adapter can affect clearance:
- Single-pipe pitless (most common)
- Dual-port pitless (designed for backup pumps)
- Position relative to Simple Pump drop pipe
Typical 4-Inch Well Scenario
What's Already in the Well
- Submersible pump at bottom
- Submersible discharge pipe (1" or 1.25")
- Electrical wiring/conduit
- Safety rope (if installed)
- Pitless adapter connection
Adding Simple Pump
- Simple Pump drop pipe (1" Schedule 80)
- Lift rod inside drop pipe
- Connection to pitless or well cap
Making It Work
Option 1: Verify Before Purchase
Contact us with:
- Exact submersible pump model and diameter
- Pitless adapter brand/model
- Whether safety rope is present
- Any other items in well
We can assess compatibility before you purchase.
Option 2: Pump Out of Well Cap
If pitless installation is too tight:
- Install Simple Pump through well cap
- Submersible uses pitless, Simple Pump uses cap
- No conflict between systems
- Manual carry of water (no pressure delivery)
Option 3: Dual-Port Pitless Adapter
Some pitless adapters accommodate two drop pipes:
- Allows both pumps to connect
- Both deliver to underground piping
- Requires compatible adapter installation
Measurement Verification
Before attempting installation:
In-Well Measurement
- Remove well cap
- Shine flashlight into well
- Observe existing equipment position
- Measure available space if possible
Paper Test
Some customers lower a piece of paper tube (rolled to submersible size + 1.5") to verify clearance throughout well depth.
Our Recommendation
For 4-inch wells with existing submersibles:
Contact us before purchasing. Provide your submersible specifications and we'll assess compatibility. Many 4-inch well installations work fine, but verification prevents problems.
Alternative: 4-Inch to 6-Inch Casing Sleeve
If your well has a 4-inch liner inside a larger bored hole:
- Well casing sleeve may allow access to larger diameter
- Consult with well professional
- Uncommon but worth checking
Need Compatibility Verification?
Send us your well details:
- Casing diameter and material
- Submersible pump make/model
- Pitless adapter type
- Well depth and water level
Technical Support: 877-492-8711 ext. 6