If you're shopping for filtration separation in a machine shop, the first decision isn't which brand to buy-it's which fluid problem you're solving. Do you need to keep cutting fluid from breaking down by removing floating oil? Or do you need dry compressed air so a plasma cutter or paint spray doesn't push water droplets into your work? These four industrial components cover both jobs, and the listed price spread is wide enough that buying on price alone would point you to the wrong product. The distinction matters: an oil-water separator cannot dry compressed air, and an air dryer cannot remove floating oil from coolant.
Quick take
Here's the short version. The three oil-water separators are all 208-240V 3-phase units built for machine-tool coolant maintenance, and they only make sense if your shop already has that power supply. Two of them sit at the top of the price range, while the third is positioned lower. All three share the same core function, so the main difference is listed price and name. If your issue is water in the compressed air line, the air dryer/water separator is a separate product at the bottom of the price range and is for a completely different job.
Price comparison
Here is the direct price comparison.
| Product | Listed price | Price bar |
|---|---|---|
| Maisutseb 208-240V 3-Phase Industrial Oil-Water Separator Oil Skimmer | USD 1,886.00 | |
| TECHTONGDA 208-240V Industrial Cutting Fluid Oil-Water Separator Oil Skimmer 3-Phase | USD 1,886.00 | |
| PreAsion 208-240V Machine Tools Industrial Oil Water Separator 3PH Cutting Fluid Skimmer | USD 1,703.84 | |
| 3/4\" NPT 4 Stage Industrial Air Dryer Compressor Water Separator for Plasma Cutt | USD 158.00 |
Decision matrix
| Shop need | Recommended pick | Price position |
|---|---|---|
| Remove floating oil from cutting fluid on machine-tool coolant systems | Maisutseb or TECHTONGDA oil-water separator | Top of the range |
| Same cutting-fluid separation at a lower listed price | PreAsion 3PH oil-water separator skimmer | Below the top of the range |
| Dry compressed air for plasma cutting or paint spray | Air dryer/water separator | Bottom of the range |
Product breakdown
Maisutseb 208-240V 3-Phase Industrial Oil-Water Separator Oil Skimmer for Cutting Fluid
This Maisutseb separator is built for cutting-fluid maintenance on machine tools. It separates floating oil from cutting fluid to extend coolant life and protect machining accuracy, with fast oil recovery, oil drainage for reuse, and a cleaning valve for sludge. Its strength is the complete oil-water separation package at a single listed price of $1,886. The main limitation is that it shares that top price with the TECHTONGDA unit, so the choice comes down to name rather than cost. It is not the lower-priced option in this comparison.
TECHTONGDA 208-240V Industrial Cutting Fluid Oil-Water Separator Oil Skimmer 3-Phase
The TECHTONGDA unit is the other separator listed at the same top price as the Maisutseb model. This is the matching TECHTONGDA alternative to the Maisutseb model. It performs the same cutting-fluid oil-water separation work for machine-tool coolant systems. Choose this if the TECHTONGDA name is what you want on the equipment. The trade-off is that you get no price difference from the Maisutseb version, and the PreAsion unit costs less for the same type of job. It also won't address compressed-air moisture.
PreAsion 208-240V Machine Tools Industrial Oil Water Separator 3PH Cutting Fluid Skimmer
The PreAsion separator is the lower-priced cutting-fluid option, listed at $1,703.84. It separates floating oil from cutting fluid and includes a cleaning valve for sludge. What works in its favor is the cost position for the same cutting-fluid maintenance duty as the two higher-priced units. It is a direct alternative to the two higher-priced models, but at a lower listed price. The downside is that it's still priced well above the air dryer, and it won't do anything for a compressed-air water problem.
3/4\" NPT 4 Stage Industrial Air Dryer Compressor Water Separator for Plasma Cutt
The 4-stage air dryer is a different filtration separation tool: it filters and dries compressed air for plasma cutting and paint spray, using three filters and one dryer with an auto drain. It has 3/4\" NPT air ports, a 1/4\" NPT gauge port, handles up to 240 PSI, and weighs 7 pounds with an aluminum tank. Its purpose is the targeted removal of moisture from compressed air, and it does that at the lowest listed price, $158. The catch is that it's not an oil-water separator, and it is not meant for horizontal installation.
Final recommendation by use case
If your shop uses coolant and has 3-phase power available, start with the three oil-water separators. The Maisutseb and TECHTONGDA units are the same price; pick based on which name you want on the equipment. If you'd rather keep the listed price down, the PreAsion is the one to evaluate. If your problem is water in the compressed air supply to a plasma cutter or paint spray, the 4-stage air dryer is the product for you. Match the product to the fluid you're trying to separate instead of shopping the price range alone.
