It says 3/8 and 1/2 bsp so does it include an adaptor of some sort? I’m after 3/8 bsp fitting

the bottle has a 3/8 inch thread and the nut section into which the bottle screws has a 1/2 inch thread

Does this fit on the top of the hot water cylinder, i see something similar on mine

The unit does not fit on the hot water cylinder, but on the central heating/hot water circulation pipework, at the highest point. Which is usually near the hot water cylinder, most often by the side of it. Hope this helps!

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ESI - Energy Saving Innovation Controls ESAVB Automatic Air Vent

Product ID: 52389652

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🔧Brass valve body

🌬️Automatic air removal

🛠️Easy to service

Description

💨 Breathe Easy with ESI's Automatic Air Vent!

CORROSION CONTROL - Protect your system from damage.
LIGHTWEIGHT DESIGN - Weighs only 140g for easy installation.
EFFORTLESS EFFICIENCY - Say goodbye to manual bleeding!
VERSATILE CONNECTIONS - Compatible with 3/8" and 1/2" BSP.
USER FRIENDLY MAINTENANCE - Service and clean with minimal hassle.

The ESI - Energy Saving Innovation Controls ESAVB Automatic Air Vent is designed to efficiently remove air from your heating system, reducing the need for manual bleeding and preventing corrosion. With a durable brass valve body and versatile BSP connections, this lightweight and easy-to-service vent ensures optimal operation and longevity for your system.

Specifications

Manufacturer	ESI - Energy Saving Innovation Controls Ltd
Part Number	ESAVB
Package Dimensions	9.2 x 3.8 x 3.6 cm; 140 g
Item model number	ESAVB
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	140 g

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