Milano angled chrome valves/tails-no seals??

Hi everyone. I'd appreciate some advice please. I have bought some Milano "minimalist" chrome radiator valves to fit to some vertical radiators.
I also bought some flow restrictors due to them being fairly tall radiators.

On unpacking the valves, I was surprised to find that the part where the tail/nut screws onto the valve body doesn't appear to have any form of seal.

What worries me is that the flow restrictors (which replace the tail at one side of the radiator) are fitted with rubber O rings which mate up to the valve body.

So why is there noO ring on the valve tails?

The valve tails are the type with the larger nut that screws directly to the valve-not the compression and olive type.

Any advice greatly appreciated. Thanks.

Bodgitnscarper said:

So why is there noO ring on the valve tails?

Click to expand...

The two mating surfaces are precision ground to create a watertight seal when tightened together,well thats the theory . Different manufactures have different ideas,some utilise an O ring.

Bodgitnscarper said:

I also bought some flow restrictors

Click to expand...

Do you mean flow diverter ? The radiator may already be fitted with a type of flow diverter.

Hot&Cold said:

Bodgitnscarper said:

So why is there noO ring on the valve tails?

Click to expand...

The two mating surfaces are precision ground to create a watertight seal when tightened together,well thats the theory . Different manufactures have different ideas,some utilise an O ring.

Bodgitnscarper said:

I also bought some flow restrictors

Click to expand...

Do you mean flow diverter ? The radiator may already be fitted with a type of flow diverter.

Click to expand...

Thanks Hot&Cold yes I meant flow diverters. I opted for these as it’s possible to see straight through from flow to return on the bottom rail of the rads.