Hi Tracey,
The diameter of the aqualuminator connector is about 1/64th smaller than standard.
I overcame the potential connection problem by glueing a quick disconnect to it to which my shutoff valve fastens - reason I went to a quick disconnect was purely so the valve can also be removed for our harsh winters and is not left in the elements.
I just made sure I really roughed the mating surfaces up well, apllied a good amount of cement to teh surfaces and wrapped the seam in electrical tape until the glue cured, it's been 4 years and still no leaks or other issues.