Hi what's the best way to connect the radiator with these as we are getting leaks

Use ptf tape on thread that goes into radiator use plenty making sure it is in the trough of the thread. Then screw into radiator, there is usually a square or Hex hole that a allen key (buy separately) goes in to assist with this. Tighten till a reasonable amount of friction is felt, do not untighten or you will need to reapply the tape. The parts that go onto the pipe. Make sure they go into to radiator valve straight and the Brass/copper olive (ring) sits over the pipe. You can also put some ptf tape over the olive and pipe . Then tighten.

Are these bi directional?

I can't say I know, but I can't see why flow would impede the valve as it is operated by heat.

In terms of room temperature what do the numbers mean?

Cannot answer it yet has not put it on wall with the new radiator

What is the dimensions of these from the outer connection but to the centre of the pipe?

Contact your supplier they should be able to help with your query

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Thermostatic Radiator Valve Set - Anthracite Radiator Valves incl. a Corner TRV & Lockshield Valve – TRV Radiator Valves Ideal for a Vertical Radiator | Sidato Caldo

Product ID: 88556197

Details

Brand
Sidato
Exterior finish
Brass
Inlet connection size
15 Millimeters
Inlet connection type
Compression
Item dimensions L x W x H
13 x 7 x 8
Number of Packs
1

🔩15mm universal compression fittings

⚙️6 precise temperature settings

🛡️durable brass with powder-coated anthracite finish

Description

🔥 Upgrade your radiator game with style and precision!

UNIVERSAL FIT - 15mm compression connections compatible with most European radiators
SMART CORNER DESIGN - Ideal for side or bottom pipe feeds, maximizing installation flexibility
PRECISION CLIMATE CONTROL - 6 adjustable settings for your perfect ambient temperature
SLEEK ANTHRACITE ELEGANCE - Powder-coated brass finish that complements modern radiators
SMOOTH SILENT OPERATION - Engineered for effortless temperature regulation without noise

The Sidato Caldo Thermostatic Radiator Valve Set features a robust brass construction with a stylish anthracite powder coating, designed for seamless integration with vertical and towel radiators. Equipped with 6 temperature settings and 15mm compression fittings, this set ensures precise climate control and versatile installation, making it a top choice for modern heating solutions.

Specifications

ASIN	B07KCJ9W4M
Best Sellers Rank	99,775 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,072 in Central Heating System Accessories
Brand	Sidato
Connector Type	Compression
Customer Reviews	4.6 4.6 out of 5 stars (539)
Exterior Finish	Brass
Inlet Connection Size	15 Millimeters
Inlet Connection Type	Compression
Item Dimensions	13 x 7 x 8 centimetres
Manufacturer	Sidato
Model Number	CLD-CRA-TRV
Number of Items	1
Number of Packs	1
Number of Pieces	1
Number of Ports	2
Outlet Connection Size	15 Millimeters
Outlet Connection Type	BSPT
Part Number	CLD-CRA-TRV
Set Name	Thermostatic Radiator Valve Set
Size	13 cm
Thread Size	12.7 millimeters
Thread Type	BSPP
Unit Count	1.0 count
Valve Type	Thermostatic Valve

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