Typically most of these Mustang overflow tanks accept 3/8" hose. If you have some larger coolant hose laying around you can always use a band clamp to tighten it into place. These aren't under extreme pressure so they won't "blow" loose. Also don't over-tighten the clamps so you don't crush the tube. These are a great way to dress up your Fox Body Mustang's engine bay and combining it with a SVE Radiator can greatly improve your cooling capabilities!!