WM Series

Captive Air and Retention Tanks

Easier to install than steel and tougher over time.

Our WM-Series offers features and benefits steel tanks just can’t match. From their corrosion-proof composite construction... to their lighter weight, easier maintenance and less expensive installation… WM-Series pressure tanks are the preferred choice of professionals.

Features & Benefits

  • Replaceable air cell assures easier field servicing.
  • Greater drawdown than comparably sized steel tanks yields greater efficiency.
  • Extended labor warranty option is available to homeowners.
  • Won’t rust in corrosive environments, particularly important in coastal regions.
  • Quicker and less costly to install, usually requiring only one person and fewer man-hours.
  • Wider pressure setting differential provides greater flexibility.

Find the Right Tank for your Installation

Applications

  • Residential
  • Light commercial
  • Pressure boosting

Specifications

WM Series Performance Data

Model Number Capacity
gal / liter
Maximum
Operating Pressure
psi / kPa / Bar
Drawdown
30/50 Setting**
gal / liter
Diameter*
inch
/ cm
Overall Height*
inch / cm
Height* inlet/
outlet to floor
inch
/ cm
System
Connection
Assembly Weight*
lb / kg
Pallet
QTY.
WM-4 / WM0060 14.5 / 55 125 / 862 / 8.6 4.4 / 16.5 16 / 41 26 / 66 1 3/4 / 4.4 1" male NPT 14.5 / 6.6 9
WM-6 / WM0075 19.8 / 75 125 / 862 / 8.6 5.9 / 22.5 16 / 41 32 / 81 1 3/4 / 4.4 1" male NPT 17.75 / 8.1 9
WM-9 / WM0120 29.5 / 112 125 / 862 / 8.6 8.9 / 33.5 16 / 41 44 / 112 1 3/4 / 4.4 1" male NPT 24.75 /11.2 9
WM-11 / WM0130 QC 35 / 132 125 / 862 / 8.6 10.6 / 40.1 21 / 53 33 / 83.8 2 1/4 / 5.7 1 1/4" male NPT 32 / 14.5 4
WM-12 / WM0150 40.3 / 153 125 / 862 / 8.6 12.1 / 45.8 16 / 41 57 / 145 1 3/4 / 4.4 1" male NPT 30 /13.6 9
WM-23 / WM0300 79.6 / 301 125 / 862 / 8.6 23.8 / 90.4 21 / 53 62 / 157 2 1/4 / 5.7 1 1/4" male NPT 65.7 / 29.8 4
WM-14WB / WM0180 47.1 / 178 125 / 862 / 8.6 14.1 / 53.5 21 / 53 41 1/4 / 105 2 1/4 / 5.7 1 1/4" male NPT 43 / 19.5 4
WM-20WB / WM0235 60.0 / 227 125 / 862 / 8.6 18.0 / 68.1 24 / 61 41 1/2 / 105 2 1/4 / 5.7 1 1/4" male NPT 50 / 22.7 4
WM-25WB / WM0330 86.7 / 328 125 / 862 / 8.6 26.0 / 98.5 24 / 61 55 1/4 / 140 2 1/4 / 5.7 1 1/4" male NPT 72.75 / 33.0 4
WM-35WB / WM0450 119.7 / 453 125 / 862 / 8.6 35.9 / 135.9 24 / 61 74 1/4 / 189 2 1/4 / 5.7 1 1/4" male NPT 95 / 43.1 N/A

Note: Maximum external operating temperature 120°F (49°C). Maximum internal operating temperature 100°F (38°C). Minimum operating temperature 40°F (4°C).

* Diameter, height and weight may vary slightly without notice.

** In keeping with current industry standards, drawdown factors are based on Boyle's law. Actual drawdowns will vary depending upon system variables, including the accuracy and operation of the pressure switch and gauge and operating temperature of the system.