OK just got this thing, no markings for flow directions and two conflicting answers for inlet and outlet. which is correct?

I see where the confusion is. The fittings seem to be on backwards. At least for my rig. Not to mention it's backwards in one of the promo pix. Way to go Neiko! Here's how I'm fixing mine. Female quick disconnect is fixed on my compressor, male quick disconnect -----> 1/4" FNPT ($6 for two) filter (the shiny drain valve should point back to the compressor, not the tool) *** Ideally the last piece would be a 1/4" FNPT to 1/8" BSPT (but I can't find one) 1/4" MNPT to 1/4" MNPT ($7.80 for four) 1/4" FNPT to 1/8" BSPT (running an airbrush, so I have to reduce down to this quirky size)

I have a supply air line hanging from the ceiling and I connect to the bottom of it. Which way would the filter be hanging for best performance?

yes the valve should be at the bottom ! These filters appear to work both ways @! i have several and there don't appear to be any restriction on air flow either way i hook it up ! It should be fine both ways ! Might want to try it and see if it affects air flow for you ?I really don't care for it in the line and rather use it mounted on my paint gun ! I use the throw away ones for painting and this style for air tools with them mounted to the tool itself !

Can I put this after the regulator or will that drop pressure too much?

I recommend the bottom of you gun if possible. It is made to allow free flow. The pressure may drop a fraction of a pound. Not enough for anything... it pretty much just filters the moisture so you don't have water spots out your gun as you spray. I used it in line for an airbrush but would recommend an iwata if you are using it for that application

Why are the reviews and questions for this model (30253A) the same as for model 30252A? There is clearly an error.

Check the manufacturer's specifications. It might be small dimension changes that do not affect the ability of the unit, i.e. length, diameter, etc.

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💨 Elevate your air game — keep it clean, keep it powerful!

INSTANT VISUAL MONITORING - Clear casing lets you track trapped water and debris without guesswork.
PRECISION AIRFLOW CONTROL - Maintains clean, oil-free compressed air to optimize tool performance and consistency.
QUICK RELEASE DRAIN VALVE - Easily remove accumulated moisture and contaminants to keep your workflow uninterrupted.
KEEP YOUR TOOLS DRY EFFICIENT - Stops moisture, oil, and particles from damaging your air tools for longer lifespan.
BUILT TO LAST IN TOUGH ENVIRONMENTS - Durable aluminum housing with brass fittings withstands daily rugged use.

The NEIKO 30252A is a compact, durable water and oil separator designed for 1/4" NPT air lines, supporting up to 90 PSI. It protects pneumatic tools by filtering out moisture, oil, and dust, ensuring cleaner compressed air and extending tool lifespan. Featuring a clear housing for easy monitoring and a quick-release valve for hassle-free maintenance, this accessory is essential for any professional aiming to optimize air compressor performance and reliability.

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Brand	Neiko
Voltage	100 Volts
Power Source	Compressed Air
Colour	Reddish
Special Feature	Automatic Shut Off
Item Weight	0.22 Pounds
Style	Oil/Water Separator - 90psi
Item dimensions L x W x H	17.3 x 13 x 5.1 Centimeters
UPC	837013302520
Global Trade Identification Number	00837013302520
Manufacturer	Ridgerock Tools Inc.
Country of Origin	USA
Item model number	30252A
Product Dimensions	17.27 x 12.95 x 5.08 cm; 99.79 g
ASIN	B002GQ3SUA

NEIKO 30252A Water and Oil Separator for Air Line | 1/4" NPT Inlet and Outlet | 90 PSI | Air Compressor and Air Tool Accessory | Protect Lifespan of Pneumatic Tools | Optimize Performance

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