I've got a couple of those things. These are a little different design, but they accomplish the same thing. These came with those gravel cleaning siphon thingabobs. You're welcome to one of them if you want it.
Give me your address and I'll mail one to ya.
You can email me at: tomsrowe@hotmail.com if you like.
BTW: these ones I have look a little fancier than the one in that picture. These have the ability to pinch the hose if you want to do so. I guess that's so you can adjust the flow if you choose to.
Tom