Measure it, look for markings on the hose or fittings, or take it off and take it to a shop that makes hoses and they can make one identical.
But there is NO WAY to answer such a vague question. There are many hoses and many different fitting sizes and types on every tractor, your workmaster included. They way you post the question it seems you think there is only one single hose on that machine. There isnt and we have no clue which hose you are talking about