How durable is this compressor as a replacement for a Thomas oilless compressor rated for continuous duty ?

I never had a "Thomas Oilless", but my california air tools compressor is constantly running 8 hours a day to run a cnc machine. It's held up very well.

What size is the drain valve?

Typical tank drain, 1/4" npt I believe

Is this sames as c.a. technologies go portable compressor ?

While I haven't seen CAT's nomenclature, it's a compact work horse. I can recall when 25" TVs were first considered portable but how definitions change. When I bought my CAT material construction, size, intended application (hobbyist, light, infrequent duties around the house), AND generated noise level remained my main prioritized considerations. I wouldn't call this light and I keep a small moving around but haven't mounted any casters. Until the day arrives when casters become a daily necessity, I chose to keep the mobility temporary to move my CAT.

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CALIFORNIA AIR TOOLS CAT-4620AC 4GAL 2HP Twn Compressor, Silver

Product ID: 32556931

Details

Brand
California Air
Noise Level
70 db
Power Source
Corded
Recommended Uses For Product
Air Brushing
Voltage
110

⚡2.0 HP powerful motor

🔇70 dB ultra-quiet operation

🛠️Oil-free dual piston pump, 3000+ hrs life

Description

🔧 Power meets peace: The quiet force your projects deserve.

ENERGY SMART SAFE - Low 14 amp draw with thermal overload protection and easy start valve for cold starts.
ROBUST 2 0 HP MOTOR - Delivers consistent, durable performance at a low 1680 RPM for less wear.
WHISPER QUIET POWER - Operates at just 70 dB—work without the noise distractions.
PORTABLE LIGHTWEIGHT - 4.6-gallon aluminum tank weighs only 64 lbs—easy to move around any jobsite.
MAINTENANCE FREE OIL FREE PUMP - Dual piston design with 3000+ hours lifespan keeps your workflow smooth and hassle-free.

The California Air Tools 4620AC is a professional-grade, ultra-quiet 2.0 HP air compressor featuring a durable oil-free dual piston pump with over 3000 hours of life. Its 4.6-gallon lightweight aluminum tank and low 70 dB noise level make it perfect for noise-sensitive environments and portable job sites. Designed for efficiency with a low 14 amp draw and thermal overload protection, it ensures reliable, maintenance-free performance for demanding tasks.

Specifications

ASIN	B005SOD08M
Additional Features	Portable
Air Flow Capacity	6.4 cfm
Best Sellers Rank	#264,851 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #212 in Portable Air Compressors
Brand Name	California Air Tools
Capacity	4 gallons
Color	Silver
Customer Reviews	4.4 4.4 out of 5 stars (454)
Global Trade Identification Number	00743369740209
Included Components	Filter
Item Dimensions L x W x H	20.7"L x 18"W x 21"H
Item Type Name	Air Compressor
Item Weight	68 pounds
Manufacturer	CALIFORNIA AIR TOOLS
Manufacturer Part Number	CAT-4620AC
Manufacturer Warranty Description	1 Year Limited Warranty
Material Type	Aluminum
Maximum Horsepower	2 hp
Maximum Power	2 hp
Maximum Pressure	125 bar
Model Name	CALIFORNIA AIR TOOLS CAT-4620AC 4GAL 2HP Twn Compressor
Model Number	CAT-4620AC
Noise	70 db
Number of Items	1
Power Source	Corded Electric
Recommended Uses For Product	Air Brushing, Drilling, Nailing, Spraying
Style	Aluminum Tank, 110v
Tank Volume	4.6 gallons
UPC	743369740209
Unit Count	1 Count
Voltage	110 volts_of_alternating_current

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