Flat Flange Deep Well Pump System

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Use the Flat Flange Deep Well Pump System if your well specs meet one of these scenarios:

Static Water Level:250' or less
Well has a Casing:No
Static Water Level:250' or less
Well Casing is Below Grade (Ground):Yes
Static Water Level:250' or less
Water Source is a Tank or Cistern:Yes
Freezing is an Issue:Yes

View more detailed information about the Standard Deep Well Pump at Flat Flange Deep Well Pump Basics.


The Bison Pumps Flat Flange Deep Well Pump System is a Side-By-Side Deep Well Pump that can be installed in the same well casing as your electric submersible pump system. It is a Freeze Proof pump system that can deliver you with Pressurized Backup Water when used in conjunction with the Pressurizing System. This provides you with water inside your home accessible to any water feature such as a toilet or sink! It can lift water from 250 feet deep using the standard handle or up to 300 feet with the addition of the Heavy Duty Pump Head option.

Well Pump Adapter

The Flat Flange well pump adapter is designed to be bolted onto a surface with a gasket between the flange and the mounting surface. Bison Pumps offersΒ Security FastenersΒ for this application if needed. There must be a hole in the mounting surface large enough for both the pipe and the cylinder to pass through. We recommend a hole greater than 3 1/2 inches in diameter. Typically, customers build a structure over the well that is within the recommended heights (12” – 18”) above grade. The cylinder and drop pipe and rod are fed through the access hole and installed in a normal fashion. The pump head is bolted to the structure, which must be strong enough to prevent any motion when the handle is pumped during operation.

When the water source is a tank or cistern, the flange would be attached to the tank surface (assuming it is at an appropriate height for operation). Otherwise, it too would need a structure built over the access hole to raise the pump head to an operating height.

Drop Pipe and Rod

Each Bison Pumps Side-By-Side Flat Flange Deep Well Pump System comes with enough eight (8) foot sections ofΒ Drop Pipe and RodΒ to reach approximately 20 feet below the static water level. This depth allows for fluctuations in the water table and ensures that the cylinder will be below the water surface. The size of the Drop Pipe is typically 1 1/4” but we do offer and recommend 1” for certain applications. This would be where inside casing space availability is a concern or the static water level exceeds 160 feet.

Note that the deeper the static water level is the more drop pipe will be required. This directly impacts the cost and design of the system. This is why a fixed cost for a pump system cannot be provided. Each pump system is unique to the customer’s well specifics.


One appropriately sized cylinder is included in a Side-By-Side Flat Flange Deep Well Pump System. In aΒ Lift Pump system, like the Side-By-Side Flat Flange, the actual β€œpump” is the cylinder. This is the device that creates the vacuum to draw water into the water inlet and then uses its piston assembly to lift the water up the drop pipe. In a Side-By-Side application, the size of the cylinder is determined by space available inside the well casing (if there is one) and the static water level. We use this Standard Cylinder Selection Chart to determine the appropriate size for each customer’s situation.


Design and Construction

  • Stainless Steel Construction of Pump Head, Lift Rod, Handle and Hardware (to prevent rust and ensure safe, uncontaminated water)
  • Welded Components
  • Hand-Polished (for a professional shine finish)
  • Delivers Approximately 20 oz. per Stroke (with a 3-inch cylinder)
  • Pumps from 250 Foot Depth (Static Water Level is 250 feet or less)
  • Freeze Proof (built to withstand harsh climates)
  • No Priming Needed
  • No Routine Maintenance
  • Lifetime Warranty


Pump Head

  • Overall Height: 39”
  • Inlet Connection: 1 1/4” NPT
  • Spout Connection: 3/4” Garden Hose male thread
  • Handle: 36”
  • Weight: 22 pounds

Pipe and Rod

  • Overall Length: 8’ standard (4’ available)
  • Pipe Diameter: 1” or 1 1/4” NPT Schedule 120 PVC threaded
  • Rod: 3/8” diameter 304 Stainless Steel
  • Weight: Approximately 8 pounds per 8 foot section


  • Overall Length: 22.5” (24.25” with plastic filter installed)
    Cylinder DiameterStroke
    Cylinder Weight
    1.5"4 oz3 lbs
    2.0"8 oz3.5 lbs
    2.5"12 oz4.5 lbs
    3.0"20 oz6 lbs


  • 1 – 304 Stainless Steel Pump Head with Flat Flange
  • 1 – Flat Flange Gasket
  • 5 – Installation Bolts with nuts and washers
  • 1 – Deep Well 304 Stainless Steel Cylinder (with safety rope net)
  • 1 – Schedule 120 PVC Drop Pipe and 3/8” Stainless Steel Rod (in 8’ lengths sufficient to reach approximately 20’ below your static water level)
  • 1 – Brass Hose Bibb Cap
  • 1 – Installation Paddle
  • 1 – Rod Retrieval Tool
  • 1 – Installation Manual


Most Bison Pumps Flat Flange Deep Well Pump Systems can be installed by two handy people without the need for a professional. When the system’s pipe & rod quantity exceeds nine (9) sections, we recommend using mechanical devices for lifting. For a professional installation, you can contact one of our many dealers across the country. You can find a dealer near you by visiting ourΒ Dealer LocatorΒ page.



Related parts:

Maintenance Kits

Related maintenance kits:


Related accessories:


This pump has these options that must be purchased at time of order: