Castair 8TT150E — 8 Gallon Twin Tank Air Receiver, 150 PSI, Electric Configuration
The Castair 8TT150E is an 8-gallon twin tank air receiver built for electric motor compressor assemblies. It shares the dual-tank architecture of the 8TT150N (non-code twin tank), but the "E" suffix designates an electric-specific configuration — typically a top plate sized and drilled for electric motor mounting requirements rather than the standard non-code variant.
If you are building or rebuilding a twin tank portable compressor with an electric motor, the 8TT150E is the correct tank. If you need the standard twin tank, see the 8TT150N. If you are unsure which variant your existing compressor uses, the top plate dimensions are the distinguishing spec — call us before ordering.
What the Twin Tank Design Provides
The twin tank configuration places two smaller cylindrical receivers side by side, connected at the manifold, rather than using a single longer or taller vessel. The 8TT150E delivers the same total air storage as a single 8-gallon tank but with a geometry that keeps the height lower and distributes weight across two support points. For portable compressor use, that means a more stable unit on uneven surfaces and a lower center of gravity.
The 17x34" overall footprint (based on the 8TT150N base specs) gives you roughly the equivalent air storage of an 8-gallon single tank, but spread across a wider, lower profile. This is why twin tank designs are common in contractor portables — they roll and park more stably than a vertical tank, and the lower profile fits in more vehicle cargo configurations.
Tank Specifications
- Part Number: 8TT150E
- Configuration: Twin tank (dual horizontal receivers, side by side)
- Capacity: 8 gallons total
- Overall Dimensions: Approximately 17" x 34" (based on 8TT series; confirm current spec with us if critical)
- Top Plate: 9" x 24" (8TT series standard — verify E variant plate dimensions before ordering for an existing motor)
- Maximum Working Pressure: 150 PSI
- Weight: Approximately 68 lbs (8TT series base weight; E variant may differ slightly)
- Drive Configuration: Electric motor mounting
- ASME Code: Non-code
Electric Configuration vs. Non-Code Variant (8TT150N)
Cast Air offers the twin tank in both the 8TT150N (standard non-code) and 8TT150E (electric) variants. The distinction between them lies in the top plate configuration. Electric motor mounts may require different bolt patterns, different plate lengths, or specific clearances for conduit and terminal box access that differ from a gas-engine or belt-drive layout.
If you are replacing a tank on an existing electric-motor twin tank compressor, match the existing top plate dimensions to the 8TT150E spec before ordering. If you are building from scratch with an electric motor, the 8TT150E provides the correct mounting geometry for that application.
For the full twin tank assembly with wheels, axle, handle, vibration pads, and belt guard included, Cast Air also offers the 8TT150NC complete kit (based on the 8TT150N). If an E-variant complete kit is needed, contact us to confirm current availability.
Twin Tank Architecture: Practical Notes
- Manifold connection: The two tanks are connected via a cross manifold at the center. Pressure equalizes between tanks continuously during operation.
- Drain valves: Each tank cylinder typically has its own drain valve. Drain both sides regularly — moisture accumulates faster in twin tank configurations with more condensation surface area.
- Stability: The wide, low stance of the twin tank is its primary job site advantage. It does not tip the way a tall single-tank unit can when moved across uneven ground.
- Weight distribution: At approximately 68 lbs for the tank alone, the assembled compressor will be substantial. Plan your wheel and axle selection accordingly — the 3/4" axle hardware (AT34 twin tank axle, AB34 axle bolt) is rated for this weight class.
Accessories for the Twin Tank
If you are building out the full portable assembly, Cast Air offers matched accessories:
- AT34: Axle for twin tank configuration (3/4")
- AB34: Axle bolt 3/4" for 20-gallon/twin tank applications
- Handle 8 Gal T.T. Set (3432008A): Handle set designed for the 8-gallon twin tank form factor
- Wheels: W10x3x.75 (10" x 3" with 3/4" bore) appropriate for the heavier twin tank assembly
Or contact us to confirm whether an 8TT150E-specific complete kit is available.
8 Gallons Twin Tank vs. Other Configurations
Choosing between the 8TT150E twin tank and other Cast Air tank configurations comes down to:
- vs. 8P150D/8P150B single tank: Twin tank is heavier and wider but more stable. Single tank is lighter and more compact. Same total capacity.
- vs. 20-gallon portable (20P150C): If you need more air storage buffer and less frequent cycling, the 20-gallon is the next step up. For high-demand tool use, 8 gallons will cycle the compressor heavily regardless of tank configuration.
- vs. stationary shop tanks: The twin tank portable is for applications that move. If the compressor stays in one place, a stationary coded vessel gives you better pressure ratings and more storage per dollar.
Note on Specifications
Cast Air does not publish a separate detailed spec sheet for the 8TT150E variant on their public catalog. The dimensions and weight listed here are based on the 8TT series base specifications (8TT150N: 17x34", 9x24" top plate, 68 lbs). The E variant top plate configuration for electric motors may differ. If you are specifying this tank for a precise installation — matching an existing motor mount pattern, fitting within a specific frame, or ordering for a fleet build — call us at 866-217-0063 to confirm current specifications before ordering. We can get the exact current spec from Cast Air directly.
Why Buy From Air Compressor Factory Direct?
- Specialist supplier: We source Cast Air tanks directly from the Minnesota manufacturer. OEM parts, not generic alternatives.
- Free shipping on qualifying orders
- Free technical support: Call 866-217-0063. The difference between the 8TT150E and 8TT150N is meaningful if you are matching an existing motor mount. We can confirm the right part before you order.
- Full manufacturer warranty on all Cast Air tanks
- Honest guidance: If the 8-gallon twin tank is not the right fit for your application — wrong drive type, wrong capacity, or wrong top plate — we will tell you and point you to what is.
Call 866-217-0063 for quick answers and help!
