Petzl Djinn, Straight Gate
A wide-opening snaplink with a smooth opening action and keylock gate. As a cowstail karabiner it has most of what you need!
The Djinn is a quality, cost effective piece of kit that is available in both straight, and bent gate versions. Greater care is needed if a caver chooses the second option, because the more easy clipping action, also makes it marginally easier for the rope to unclipping itself under some circumstances...
Weight 45g. Strength on main axis 23kn: gate open, 9kn; and cross-loaded, 8kn.
Made in France.