Hydropneumatic Systems

Captive Air Tank

WMTM Series

Our "WM" captive air tank series are the ideal choice for new and replacement installations for residential, light commercial and pressure boosting applications.

Low- Profile TM Series

Our "Low Profile" series are designed for height restricted applications such as mobile homes, crawl spaces and closets.

Feature & Benefits

Corrosion-proof composite construction

• One piece, seamless inner shell molded of premium high-density polyethylene
• Durable blow-molded interior air cell is fully replaceable and constructed of heavy-gauge engineered polymer
• Bottom inlet/outlet assembly is custom molded of high-impact PVC Sturdy molded polymeric base is corrosion and impact proof.
• Outer shell is a composite of continuous fiberglass strands sealed with high-grade epoxy resin

Replaceable Air Cell

• Greater drawdown than comparably sized steel tanks for greater efficiency
• NSF: The entire range of WellMate Residential Captive Air tanks are listed under ANSI/NSF Standard 61 for water system components.
• Factory Backed Warranty: Five year warranty from date of installation.
• Light Weight minimizes labor cost; no need for heavy equipment

Applications

• Residential   • Light Commercial   • Pressure Boosting

Specifications

WM 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	100 / 700 / 7.0	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	100 / 700 / 7.0	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	100 / 700 / 7.0	8.9 / 33.5	16 / 41	44 / 112	1 3/4 / 4.4	1" male NPT	24.75 /11.2	9
WM-12 / WM0150	40.3 / 153	100 / 700 / 7.0	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	100 / 700 / 7.0	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

Low-Profile 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-6LP / WM-LP-075	19.3 / 73	100 / 700 / 7.0	5.8 / 21.9	24 / 61	20 1/4 / 51	2 1/4 /5.7	1" male NPT	22.75 / 10.3	8
WM-10LP / WM-LP-130	34.5 / 131	100 / 700 / 7.0	10.4 / 39.2	24 / 61	28 /71	2 1/4 /5.7	1" male NPT	29.5 / 13.4	8

Note: Maximum external operating temperature 120⁰F (49⁰C). Maximum internal operating temperature 100⁰F (38⁰C). Minimum operating temperature 40⁰F (4⁰C). * 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 very depending upon system variables, including the accuracy and operation of the pressure switch and gauge and operating temperature of the system.