Specification

Water Heater Expansion Tanks
Water Worker Water Heater Expansion Tanks safely control pressure buildup and fluctuations during
water heater operation. Absorbing this expanded water eliminates the hazards of relief valve discharge,
water hammer and fixture damage while saving water and energy. Plumbing codes and all major water
heater brands now require installation of an expansion tank in any closed piping system.
Polypropylene liner provides a corrosion
resistant reservoir.
Maximum working pressure: 150 psi.
Maximum operating temperature: 200° F.
Factory pre-charge: 40 psi.
Water Heater Expansion Tank
Model
Tank Volume
(Gallons)
UPC
(000815)
Ship
Weight
(lbs.)
Package Dimensions (Inches) Sys. Conn.
NPTF*
(Inches)
Length Width Height
G-5
with saddle valve
2.0 900083 8 8 8 13 3/4
G-5L 2.0 900137 5 8 8 13 3/4
G-12
with saddle valve
4.4 900090 12 11 11 16 3/4
G-12L 4.4 900144 9 11 11 16 3/4
*Stainless Steel System Connection.
Strong steel
tank with
durable finish.
Deep drawn
steel domes
for maximum
strength and
pressure rating.
Heavy duty
diaphragm
separates water
from air.
Air cushion
controls expanded
water to prevent
excessive pressure.
Water Worker expansion tanks are specifically designed for each application. All feature deep drawn
steel dome construction and a heavy duty diaphragm for extra-long life. Colorful and informative
packaging helps differentiate each model to ensure proper product selection.
Deep drawn steel domes for maximum strength.
Heavy duty diaphragm for extended life.
Made in the USA.
5-year warranty.
Solid bronze for copper tubing.
Fits 3/4” NPT connection.
Available on G-5 and G-12 models.
Saddle Valve for Easy Installation