This is a simple adapter to allow our Compressed Air Rocket launcher to work with other brand compressed air rockets. This is a simple print that slides over the end of our standard launch tube to make it the proper diameter to accept an Estes air rocket. Also, remember that using a 1/2" NPT male thread to 3/8" NPT Female thread adapter and a 10-12" long length of pipe in place of our standard launch tube will allow you to launch Stomp Rocket brand rockets. Fair warning - at higher pressures you may blow off the foam noses on these other brands... Now go launch something!