And maybe this goes without saying, but it took me a season to figure it out, take the adapter off the sanicon handheld so it is NOT squirting through the 3/4" hole. This is a lot easier on the sanicon hose, and far less pressure to cause it to pop (or is it poop) off.
And take someone with a spare foot with you all the time.
Wow! I would not have thought someone would try it that way! Perhaps that may be TzrNPeg's (and others) issue!
The 'adapter' on the handheld end on my old sanicon- Are you referring to the part with the stepped pipe threads on it? 3/4 cap on the bottom? (Found an image on google, below)
When there are threads on the port where we park, its not a problem. Things hold well. Its when we had to rely on the friction fit because the port we have to plug into is smooth pipe.
The 'stinky slinky' 90* 'termination' end has a smooth area after that fits (so far...) far and tight enough to hold to the ground port, even with slight hose tension when emptying. The bottom part of this fitting:

This is really close to what I have, and notice the lack of a significant protuberance on the end. (I am not sure if mine has even this much, I am far from mine at the moment.) This makes for a poor fit that pops out when using a port with no threads on it when the sanicon starts a pumpin'.

There is a 3/4 cap on the bottom of this to adapt to garden hose. I DO remove that, of course. well...now...

FULL DISCLOSURE-

first time using it I did NOT take the 3/4 cap off, and with the adapter in the ground I was quite puzzled as to why nothing was pumping, and with that cap hidden (it was already screwed to the ground port....couldnt see it..

) it took a while for me to have the 'AH HA!' moment and solve things. I am VERY lucky a loose joint somewhere else didnt pop off with 'loose fire hose' type results..

Maybe I am missing another piece that can be taken out... will look. But even then, it seems there is not enough to 'friction fit' and hold in the ground port with a slip fit. The 'General Store' at the park had a flexible 'donut' that was supposed to seal and hold the hose end, but it did nothing.
They also had a 'Sewer Pig' for ~$35, but it didnt fit over the height of my sanicon adapter. Would work great on the 3" 90* adapter I have now, but so far I have had no 'slip outs' with that.

We have not been to that many (less than 10) places with full hookup, and one we frequent twice a year has no threads on their ports. So maybe this is a very isolated problem.
But if I am not removing a piece I should be (and not understanding what ""take the adapter off the sanicon handheld so it is NOT squirting through the 3/4" hole"" means

) I am MORE than willing to be educated. PLEASE!
