Amtrol
Amtrol (141S351) RO Steel Pressure Tank 4.4 Gallon 1/4" NPT White
$177.99
The Amtrol 141S351 is a 4.4-gallon steel pressure tank engineered with the company's pioneering diaphragm technology developed over four decades of reverse osmosis innovation. This NSF-listed tank delivers 2.8 gallons of usable storage capacity with a fully enclosed polypropylene and butyl reservoir that ensures water purity without the rubber contact issues common in bladder-style tanks.
SPECIFICATIONS
Amtrol 141S351 Technical Details
| Model Number | Amtrol 141S351 |
| Total Capacity | 4.4 Gallons |
| Usable Storage Capacity | 2.8 Gallons |
| Connection Size | 1/4" NPT |
| Dimensions | 11" Diameter x 15" Height |
| Construction | Steel body with polypropylene/butyl diaphragm |
| Certifications | NSF Listed, ISO Certified |
| Warranty | 5 Years |
INSTALLATION & USE
Installing Your Pressure Tank
- Mount the tank vertically in a location with adequate clearance for the 11" diameter and 15" height, keeping it accessible for future maintenance.
- Connect the 1/4" NPT fitting to your RO system's storage line using thread sealant tape, ensuring a watertight connection without overtightening.
- Pre-charge the air side of the tank to 5-7 PSI using the air valve before filling with water to optimize diaphragm performance and water discharge.
- Allow the system to fill completely, then check for leaks at all connection points and verify consistent water pressure during draw-down.
COMPATIBILITY
System Requirements
The Amtrol 141S351 works with all standard residential and light commercial reverse osmosis systems equipped with 1/4" tubing connections. The tank's 2.8-gallon usable capacity is ideal for households with moderate to high water consumption, providing sufficient reserve volume to reduce system cycling and extend membrane life. Compatible with both under-sink and utility room installations where steel construction is preferred over composite materials for durability and longevity.
🔧 Check and adjust the air pre-charge every 12-18 months using a standard tire pressure gauge at the Schrader valve. Proper air pressure maintains the diaphragm position and prevents waterlogging, which is the most common cause of reduced capacity in pressure tanks.
