It is possible that you got the high pressure quick connect, or the NG quick connect parts. Visually they look the same, however, they are not interchangeable. You need to look for the "low pressure" quick connects, the most common manufacturer is MB Sturgis and it is the model 250 low pressure quick connect, both female and male.
I get all of my stuff from Calore Equipment:
http://caloreequipment.com/products/...cts-plugs.html
They handle the model 250 low pressure LP fittings, along with high pressure LP fittings for both LP and NG uses. If you went to a box store (hardware), you more than likely got the high pressure or the NG versions (that is what they stock for permanent mounting of home style gas grills) and while they do look the same, there are minute differences in the dimensions so that they can't be inadvertantly used in the wrong applications.
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My 2 cents, your mileage may vary...
Don
Bronwyn
2 Cats; J-Lo and Ragamuffin
2011 Keystone Cougar 318SAB
2011 Ram 2500 Longhorn CTD HO
Built in brake controller and exhaust brake
Tri Glide TrailAir Pinbox / B&W Companion Hitch