Petcock

I just received a new petcock (husqvarna 15 14 021 01) for the restro on my MI 400, and as I turned the lever 'plink'..the retainer ring pops out along with everything else it held in place. The snap ring isn't like a cir clip with ears, you need to compress this, but I'll be $#@@ if I know how to do it.
I am inclined to return it..is this common or do I have a 'lemon'?

toss it in the trash,, buy a used 78 to 83 style, and swap out the nipple, the newer ones use a plastic hose nipple, the older bikes used a cast steel,
what i did was drill out the cast steel nipple, and open up the hole for more fuel.
remove the tank screen, and toss it in the trash, install a in line filter.
when you install, make sure no paint is on the threads. and the small gasket is in good shape,
a bit of patrolium jelly on it will help the install and help seal, and wont hurt the rubber.
once those are taken apart they are really never the same.. and tend to leak for life..
im sure they had a special tool that was used to put them together.