It's convenient to use when trying to clean areas you can't reach. Holds a decent amount of water. It's simple enough, just take off the nozzle and add in water. Good for hips or complicated onaholes
I bought a hip a few months ago and while the hip already allowed me to clean it easily due to its two dual ways, I always just wanted something to make it easier for me to get any left overs out.
It did the job that I wanted it to do. While it does cost about 1200 Yen at time of purchase, I would say if it was cheaper, then this would have been a decent product to get at a very good price. Overall, a good product to get if you own a Hip in order to full clean its insides.
So I had recently bought my first "hip"/large onahole and it was one where my fingers wouldn't be enough to get the deep ends of the onahole. Now the cleaning would've still been possible without this, but man a pump can really be convenient at times. I'm sure you could probably buy any kind of standard pump not just for sex use, but I thought I'd get this along with one of my orders.
It's simple enough, just take off the top and add in water. Long enough nozzle for almost any onahole out there. You won't need need this a standard "normal" sized onahole, but if you have/plan on getting a hip, this could come in handy. Not to mention a very cute box art. :)