Question 1

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

Accepted Answer

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)

Question 2

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?

Accepted Answer

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 !

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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.

ASIN	B002GQ3SUA
Best Sellers Rank	685,903 in DIY & Tools ( See Top 100 in DIY & Tools ) 600 in Air Compressors (DIY & Tools)
Brand	Neiko
Capacity	40.82 kg
Colour	Transparent
Compatible Hose Diameter	0.25 Inches
Customer Reviews	4.5 out of 5 stars 5,587 Reviews
Global Trade Identification Number	00837013302520
Included Components	1/4" NPT Water and Oil Separator
Included components	1/4" NPT Water and Oil Separator
Item Dimensions L x W x H	17.3L x 13W x 5.1H centimetres
Item Type Name	Water and Oil Separator for Air Line \| 1/4" NPT Inlet and Outlet \| 90 PSI \| Air Compressor Accessories
Item Weight	0.22 Pounds
Manufacturer	Ridgerock Tools Inc.
Material	Aluminium, Brass
Maximum Pressure	90.0
Model Name	30252A
Model Number	30252A
Number of Items	1
Part Number	30252A
Power source	Air Powered
Recommended Uses For Product	Spraying
Recommended uses for product	Spraying
Special Features	Lightweight
Special feature	Lightweight
Style	Oil/Water Separator - 90psi
UPC	837013302520
Unit Count	1.0 count
Voltage	100 Volts

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 | Water Moisture Filter Dryer

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