The Castair 20P150 is a 20-gallon portable ASME air receiver tank rated to 150 PSI. This is the tank body only — no wheels, handle, or axle hardware included. If you are building a portable air supply system for a shop, service truck, or remote work area, this is the starting point. The tank is 14 inches in diameter by 31 inches long, weighs 85 lbs empty, and carries the ASME stamp required for commercial use. The 9"x22" top plate provides the mounting surface for a compressor pump and motor if you are building a complete portable unit from components.
Tank Specifications
- Capacity: 20 gallons
- Type: Portable (horizontal orientation)
- Tank Dimensions: 14" diameter x 31" length
- Top Plate Size: 9" x 22"
- Maximum Working Pressure: 150 PSI
- Weight: 85 lbs (empty)
- Construction: ASME certified, power coded
- Part Number: 20P150
- Price: $374.99
ASME Certification on a Portable Tank
ASME certification is typically associated with stationary shop tanks, but it matters on portable tanks too. An ASME-stamped tank has been manufactured and tested to the pressure vessel code for its rated working pressure — 150 PSI in this case. Non-coded tanks are cheaper but are not appropriate for commercial shop use, insurance compliance, or professional service environments. The 20P150 carries the ASME stamp, which means it can be used in commercial and light industrial applications without code violation concerns.
20P150 vs. 20P150C: Tank Only vs. Complete Kit
Castair sells the portable tank in two configurations:
- 20P150 ($374.99) — Tank only: The bare tank body. No wheels, no handle, no axle. Order this when you are building a custom setup or already have the hardware components.
- 20P150C ($487.03) — Complete Kit: Tank plus wheels, axle, handle, vibration pads, and belt guard. Saves 15% versus buying these items separately. Order this when you are building a complete portable compressor unit and need all the hardware.
The $112 difference between the tank-only and the complete kit buys you wheels, handle, axle hardware, vibration pads, and a belt guard. If you need those components, the kit is clearly the better value. If you already have hardware from a previous build or are installing the tank in a custom frame, the 20P150 bare tank makes sense.
Tank Hardware Components (sold separately or in kit)
- Wheels: 10"x2"x1/2" or 10"x3"x3/4" options (Castair W10x1.5x.5 or W10x3x.75)
- Handle: Castair 3432013 (20-gallon portable handle)
- Axle bolt: AB34 (3/4" axle bolt for 20-gallon portable)
- Vibration pads: VP100 (4"x4"x1" rubber, 4 required)
- Belt guard: 3426007 (portable electric belt guard for PK50 and PK60 pumps)
Pump Compatibility for a Portable Build
The 20P150's 9"x22" top plate is sized for Castair's smaller portable pumps — the PK50 (2 HP, single-stage, 50 lbs) and PK60 (3.5 HP, single-stage, 55 lbs). Both are V-twin single-stage cast iron pumps designed for portable duty. A complete portable compressor build using the 20P150 tank typically pairs one of these pumps with a 1.5-3.5 HP motor, the appropriate belt guard (3426007 for PK50/PK60), and a portable-style pressure switch.
What's in the Box
- 1x Castair 20-gallon portable ASME air receiver tank, 150 PSI rated
Note: Wheels, handle, axle, vibration pads, belt guard, pump, and motor are NOT included. For a complete kit with all hardware, order the 20P150C instead.
When Does a Shop Need This
The 20P150 is the right choice when you are building a portable air supply for a service truck or remote bay, replacing a failed portable tank in an existing compressor unit, or sourcing the tank body for a custom frame build. At 85 lbs empty, it is manageable with two people and standard shop equipment. The 150 PSI rating is adequate for tire inflation, blow guns, impact wrenches, and air tools — if you need over 150 PSI for industrial applications, look at the stationary tank line starting at 200 PSI.
Why Buy From Air Compressor Factory Direct?
We stock Castair tanks in the full size range from 8-gallon portable to 240-gallon stationary, along with all the hardware components to complete a build. Free shipping (note: freight for larger tanks), free technical support at 866-217-0063, and full manufacturer warranty on all Castair tanks.
Call 866-217-0063 for quick answers and help!
