If you've seen my pictures, you know that I have an assortment of toys and nozzles. In the last couple of years, I added the double balloon nozzles to my collection of nozzles. I have both silicone and and latex rubber types. It's been a learning experience to determine how much to inflate the balloons and how best to seat them. The physical sensations differ between the two types of nozzles because the silicone nozzle is so much longer from the anal seal and has a larger volume to inflate the distal (internal) balloon.
My first double balloon nozzle was the silicone model. I accidentally blew out the outer balloon a few weeks after I purchased it when I went to get up off the bed and put my weight down on the inflated balloon. It popped but didn't cause a problem. But it turned that nozzle into a single balloon nozzle and gave me some freedom to experiment with it while I purchased a second nozzle to replace it. Eventually, I ruptured the internal balloon during experimentation of inflation limits.
Now the engineer in me knows that there is a limit to the elasticity of either the silicone or the latex rubber. So, the balance is between having the balloon inflated enough to completely expand (and hopefully seal) and having it just a bit more "overinflated" to have it seal tightly. I typically use an in-line check valve so there is no backflow into the hose and bag and the internal rectal pressure can get pretty high (enough to push the inflated balloon out through the anal sphincter muscles).
Even so, I notice that with both the silicone and the latex balloon nozzles, I can eventually find there is a spot that weakens over time somewhere on the surface of the balloon. It is visible on the balloon because the inflation isn't symmetrical. On the latex nozzle, the surface of the latex becomes rippled rather than smooth. What eventually happens is that portion weakens and then ruptures. But I've managed to extend the life of each type of balloon by carefully inflating the balloons. Eventually, the latex balloon failed (I have purchased back up latex nozzles) and my silicone nozzle has lasted for well over a year even though I noticed a weak spot on the distal balloon.
As we come to the end of the summer and the end of the North American berry season, I have been eating lots of fresh blueberries (three to four quarts a week). Let me tell you, it will give you a deep blue bowel movement and a blue enema expulsion. But I love eating them in all sorts ways. So, the other night I wanted to give myself a bit of a clean-out so that I could play with my new anal ball toy. Not looking to process a huge volume, I took on a mere 2.5 liters in the knee chest position and held it for at least 15 minutes. As was typical, there is no backflow with the check valve and gradually there was pressure building to expel. I stood up and the two balloons had me well sealed. Still, the pressure was getting stronger and as I held the balloon in, I moved toward the toilet.
Suddenly, the inner balloon failed and maybe about one-third of the enema came blowing out (note the nozzle stayed in for a few moments after it failed). The good news it was mostly clear liquid and it had a rather pleasant blueberry scent. The bad news was there was a lot of liquid that sprayed out onto the floor and the bath mat. Once I got seated, I could put a towel down and finish drying the floor. After emptying out, I cleaned up the floor and went on to playing with my other anal toys.
I now get to start with two new double balloon nozzles. It was messy, but it didn't cause too much of a mess and the odor was the scent of blueberries. YMMV! It could have been worse as it could have ruptured in a way that was much messier. I'll carefully monitor the inflation on these next set of nozzles and see how long they last.