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PRESSURE SUPPORT: Deep-drawn steel domes for extra strength (twice the strength of rolled steel).
Exclusive welding process eliminates interior rough spots and sharp edges and prevents damage to diaphragm and liner.
Every finished tank is pressure tested for leaks and design safety.
Exterior appliance-like enamel finish beautifies and protects each tank from the elements.
100% non-metallic water reservoir.
Heavy-duty butyl diaphragm flexes, never stretches or creases, with seamless construction for uniform strength. It conforms exactly to shell configuration, with no bubbles or corners to trap water or sediment.
Heavy-duty butyl diaphragm meets FDA requirements for potable water supply, does not support bacteria growth, and is the best known elastomer to prevent air loss.
Polypropylene liner and acceptance fitting provide a rigid water reservoir that is 100% corrosion resistant. Complies with and listed by National Sanitation Foundation (NSF) Standard 14.
Unique diaphragm seal ring.
Copper-lined acceptance fitting is silver brazed for watertight seal.
Factory precharge - each WELL-X-TROL is pressurized to define the pump cut-in pressure.
Air valve is brazed (not mechanically threaded) with a tamper-proof warning label. | 
1. WELL-X-TROL has a sealed-in air chamber that is pre-pressurized before it leaves our factory. Air and water do not mix eliminating any chance of
2. When the pump starts, water enters the WELL-X-TROL as system pressure passes the minimum pressure precharge. Only usable water is stored. 
3. When the pressure in the chamber reaches maximum system pressure, the pump stops. The WELL-X-TROL is filled to maximum capacity. 
4. When water is demanded, pressure in the air chamber forces water into the system. Since WELL-X-TROL does not waterlog an consistently delivers the maximum usable water, minimum pump starts are assured.