You mean spa tubing? Pictures would definitely help here. Just make sure that the leak is coming from the hose first and not a loose/leaking bulkhead. If it is from the hose itself, you should be able to use a simple hose clamp to tighten it up to the bulkhead, just make sure you don't tighten it so much that you crack the bulkhead barb. Like I said, pictures would definitely help out here...until we see pics, assumptions are gonna have to do.