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.

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FloPlast AF110G Push-Fit Air Admittance Valve - Grey

Product ID: 63331026

Details

Brand
FloPlast
Exterior finish
Grey
Global Trade Identification Number
Inlet connection type
Push-Fit
Item dimensions L x W x H
14.8 x 14.8 x
Material
Polyvinyl

✅A1 & CE approved, kite marked BS EN 12380

❄️Operates from -20°C to +60°C

🛠️Push-fit installation, no roof penetration

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Description

🚀 Elevate your plumbing game with FloPlast – where innovation meets peace of mind!

ODOR FREE LIVING - Prevents foul gases from entering your space, keeping your home fresh and hygienic
EFFORTLESS INSTALLATION - Push-fit design saves time and avoids roof penetrations for a sleek, damage-free setup 🛠️
WEATHERPROOF PERFORMANCE - Reliable operation in extreme temps from -20°C to +60°C without insulation ❄️
DURABLE LOW MAINTENANCE - Made from robust PVC with a 10-year warranty, designed for longevity and easy cleaning
CERTIFIED QUALITY ASSURANCE - A1 approved and kite marked to BS EN 12380, ensuring top-tier safety and compliance ✅

The FloPlast AF110G Push-Fit Air Admittance Valve is a compact, grey PVC valve designed to allow air into sanitary pipework while blocking foul gases. Certified to BS EN 12380 with A1 and CE approvals, it operates reliably between -20°C and +60°C without insulation. Its push-fit design enables quick installation without roof penetration, backed by a 10-year warranty for durability and easy maintenance.

Specifications

ASIN	B0059WR0TI
Best Sellers Rank	18,560 in DIY & Tools ( See Top 100 in DIY & Tools ) 137 in Central Heating System Accessories
Brand	FloPlast
Connector Type	Push-Fit, Compression
Customer Reviews	4.6 4.6 out of 5 stars (181)
Exterior Finish	Grey
Global Trade Identification Number	05055149917462
Included Components	1 x Air Admittance Valve
Inlet Connection Type	Push-Fit
Item Dimensions	14.8 x 14.8 x 12.1 centimetres
Item Type Name	FloPlast AF110G Grey Push-Fit Air Admittance Valve
Item Weight	0.44 Kilograms
Manufacturer	FloPlast
Manufacturer Warranty Description	10 years with regular maintenance.
Material	Polyvinyl Chloride (PVC)
Model Number	AF110G
Number of Pieces	1
Number of Ports	4
Outlet Connection Size	1.5 Inches
Part Number	AF110G
Set Name	1
Size	Small
Unit Count	1.0 count
Valve Type	air admittance valve

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