I bought some brass self sealing couplers at Lowe's several years ago. They might still have them. I have one on my slop sink in the brewery so that I can change between a faucet connector and/or my brewery cleaning spray hose. They have a female garden hose thread on one end that you can adapt to a hose barb with a few extra parts. You might look there if you are in a hurry to get this project completed.