Along with the best diaphragm, Defiance also comes standard with its new anti-microbial liner (polypropylene co-polymer) on the bottom half of the water chamber. The upper chamber is made of blended butyl rubber.
Solid 16 gauge steel tank, finished with the highest quality urethane paint for
stand up to the wettest basement or crawl space.
Get unparalleled performance and premium quality.
Connection: Welded steel NPT thread.
Tests: high pressure, weld bead, helium, final check of the preload.
Air valve: Brass valve with O-ring.
* It is important that the well tank size has been calculated to match the pump outlet and the number of people and facilities in the building. If you are unsure, please contact us before making a purchase.
| Manufacturer: | Flexcon Industries |
| Model: | DEFIANCE DEF20 |
| Tank capacity: | 20 Gallons |
| Body build: | Cold rolled steel |
| Body finish: | Appliance grade paint for interior or exterior installation |
| Tank Precharge: | 38 PSI |
| Lowering with 20/40 switch: | 8.1 gallon |
| Lowering with 30/50 switch: | 6,8 gallons |
| Lowering with 40/60 switch: | 5,9 gallons |
| Tank diameter: | 16″ |
| Tank height: | 29″ |
| Tank weight: | 36 lbs |
| Pipe Tap Size: | 1″ npt |
| Maximum rated pressure: | 125 PSI |
| Certification | NSF/ANSI 61-NSF/ANSI 372 |
| Limited warranty | 5 years by the manufacturer |
When should a pressure tank be replaced?
Due to its importance, the replacement of the tank should be done to prevent its breakage in its 15th year. It is always better to have a tank in good condition, it prevents more expensive pump breakage.
Watch the video on How to Calibrate a Pressure Tank (FR)
The Defiance DEF20 tank comes with a 5 year manufacturer’s warranty.
Download the Flexcon Industries PDF to view Defiance products.
For more information on pressure tanks, visit our FAQ page.



ACCESSORIES
ELECTRIC WIRES
GRAY MAGIC PIPE THREAD COMPOUND
HEATED WIRE
INSULATING TAPE
PIPES
PRESSURE TANK TEES
PRESSURE-GAUGE
WELL PUMP ACCESSORIES
CONTROL BOXES
PRESSURE SWITCHES
SUBMERSIBLE SUMP PUMP
WATER PRESSURE TANKS
SUBDRIVES
WATER WELL PUMPS
KITS
ADAPTERS
BALL VALVES
ELBOWS
PINCH CLAMPS
TEES
BUSHINGS
CAPS
CLAMPS
CROSS
ELBOWS
FOOT VALVES
INSERT COUPLING
NIPPLES
PITLESS ADAPTERS
REDUCERS
VALVES
WATER FILTERS
STRING WOUND POLYPROPYLENE CARTRIDGES
UV-MAX WATER TREATMENT
VU-FLOW
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