is this ok for fitting below or inside a vanity unit with a concealed cisten?

It worked for me. I fitted it to a enclosed stack so I would say yes it should be fine for you, hope this helps

My soil stack is on the outside of the house, can this be placed outside but below roof level, providing its still above soil flood level/below sink?

No this is not suitable for outside according to the information. You will need one that is made to go outside

Does it fit for 1.5 inches pipe?

No it's for 110mm soil pipe(approx 4.5")Hope this helps!!!

What diameter pipe does it fit into?

I'm sorry, but I can't remember. However, I installed two of them on the standard nominal 4 inch vertical sewage vent pipes on a 1979 built house protruding from the roof at the same time as the roof was re-tiled. This avoided flashing around a protruding pipe. The FloPlast was a nice tight fit aided by the rubber seals fitted to it. This was about a year or so ago.

Manufacturer	FloPlast
Part Number	AF110G
Product Dimensions	14.78 x 14.78 x 12.1 cm; 438.8 g
Item model number	AF110G
Size	Small
Colour	Grey
Material	Polyvinyl Chloride (PVC)
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Included Components	1 x Air Admittance Valve
Batteries included?	No
Batteries Required?	No
Item Weight	439 g

FloPlast AF110G Push-Fit Air Admittance Valve - Grey

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