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WellMate Fiberglass 40 Gallon Bladder Pressure Tank - WM-12

Model # WM-12
WellMate's WM-12 tank features corrosion-proof composite construction that require little or no maintenance, plus their light weight makes them easier and less costly to install. All materials meet stringent U.S. Requirements for water components and are NSF and/or FDA listed materials. WellMate continues its tradition of excellence by offering features and benefits steel tanks cannot match.

These rustproof WellMate pressure tanks are made with blow molded, fiberglass wrapped, seamless construction. They won't rust, dent, or come apart at the seams because there are no seams, and a rugged base is included. Full five-year limited warranty with a one year replacement labor allowance.

This tank now features the quick connector that snaps securely into place and is retained by an H-clip.  See the photos below.

Note: All tanks are pre-pressurized at 38 PSI, and should always be set 2 PSI below the cut in of your pressure switch. It is recommended to check tank pressure before installation. Pressure switch settings should not exceed a 20 PSI differential between cut in and cut out.

Availability: In stock

OUR PRICE $372.00
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Features and Accessories

Product Features

  • Inner liner: blow-molded polyethylene.
  • Outer shell: Filament wound with fiberglass roving and epoxy resin.
  • Bladder: Heavy-gauge polyurethane (Separates air and water).
  • Bottom inlet/outlet assembly: high-impact PVC
  • Air connection: Standard tire valve.
  • Pre-charge: 40 PSI
  • Maximum operating pressure: 125 PSI
  • Maximum temperature: 120 degrees Fahrenheit
  • Connection: 1" MNPT (Male pipe thread) Quick Connect

Additional Info


Additional Info

Model # WM-12
Material Fiberglass
Capacity 40 gallons
Connector 1" NPTM
drawdown_40_60 10.5 gallons
drawdown_30_50 12.2 gallons
Shipping Weight 29
Warranty 5 Year Limited


Pressure Tanks

How much air pressure should my pressure tank have?

This depends on which pressure switch you have.  If you have a 40/60 switch, the air pressure in the tank should be set to 38 PSI.  The general rule is to set the pressure at 2 PSI below the cut-in pressure (the pressure at which the pump turns on).
To set this accurately, your well pump must be turned off and all water needs to be drained from the tank.  

What is Drawdown?

Drawdown refers to the amount of water available in a pressure tank for use before the pressure switch turns the pump back on to replenish the supply.  The larger the drawdown, the longer your pump will run for each cycle increasing pump life by reducing the number of times the pump has to turn on. 

Product Literature


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