What type of connector do I need?

Hi all - I have an old watering system - Hozelock is the brand. Anyway I am missing a part necessary to connect it to the hose, and I am wondering whether with sight of the joint you might be able to help? Just a description of what I should be asking for in the shop.

I had a look on the web for Hozelock connectors but nothing looked right.
Image is attached.

 

Yay that did it thanks