Does anyone have experience in making their own retention nozzles??

Does anyone have any experience in making their own retention nozzles? Can anyone make one from silicone? Did you use house hold tools?

I have in fact. Although not inflatable, I took the rubber handle from a fiberglass handled shovel from home depot(approx 6" long), Drill small hole in top, heat it up so it becomes flexible and stretchable, coat the inside with lube, baby oil, lotion astro glide etc, and work in 2 golf balls, 1st one about and inch from top then spacing the second one. let cool off and remove golf balls. Or leave in if you like LOL. makes a nice toy too. Then I found the appropriate sized garden spray nozzle that is adjustable and fits inside the piece . this is for my outdoor enemas.