First of all. Comfortable and durable double balloon inflatable/retention nozzle with approx. 500сс/250сс volumes. I believe the perfection is somewhere in between rusch latex double balloon ones, rusch yellow single and double balloon ones and ones produced by Klystra.
I have are a lot of ideas on how it should be designed and built, but currently i don't know anyone, who able to perform it.
If anyone interested - i am open to discuss this subject.
Second. Transparent Klystra's silicone bags where almost perfect. I have one. Hope it will live longer than me. It will be better with liters and quarts scale. And made at least in three sizes: 2, 3, 4 liters/quarts.
The connectors that they made also was very good.
3. Flowmaster pumps made in silicone, not rubber like the current ones in OHN store.
4. Hybrid of colon tube and balloon nozzle.
5. Commercial-grade electric pump that can be controlled from remote control and from computer, so that i can easily write some scripts for it actions. It should be able to measure amount of injected water and backpressure. And able to give stable or pulsing flow of wide range of pressure.
6. Special inflatable retention nozzle, that can be restrained in place with some kind of waterproof straps, that will not interfere with spanking and intercourse. And can be detached from tubes so that can be used, for a hidden wearing under clothes.
7. Flow meter that can be disassembled and cleaned easily.
8. Good and safe liquid soap specially made for enemas.
Not the enema gear, but closely related...
9. Blindfold, that totally blocks light and very hard to undone without hands, but soft, comfortable and looks sexy.
10. Ball gag, that constructed like one in a Insex's Molly Glamoursink Enema. The design totally differs from classical with two details. First - the strap attached not to the middle of ball, but to the outer side. Second - the strap attachment is combined with breathing tube.
Something close are sale by https://silencilicone.com/ but it not the same.
11. Commercial-grade bondage/suspension rack, that can be easily assembled and disassembled.
12. Commercial-grade bondage table, like one in a Insex's Molly Glamoursink Enema.