Best-Fix supplies both Euro and Orion connectors. The Euro fitting is originally a German fitting and has an air passage of 7 mm. An Orion fitting is a Swedish fitting with an air passage of 5 mm.
A larger air passage gives more capacity because there is less energy loss. Best-Fix therefore supplies her pneumatic equipment with a Euro coupling. Of course Orion cooupling is also possible, in that case please mention this with your order.