I just installed my HKS BOV to my piping. I do have the o-ring in it and the taper on the c-clip is facing upwards as described in the HKS manual.

Thing is it seems pretty loose. I can easily spin it and move it a bit in its flange. Surely this can't be proper? I've never installed one before so I would like your feedback. Here's a little video I took showing how much play there is:



Seems like a considerably thicker o-ring would correct this?

 

try the c clip with the other way. Mines basicly doesn't move

 

Exactly

there should be no play whatsoever.

 

No play on my end

 

I'll flip the c clip around upside down tonight and see how that goes

 

Well flipping the c-clip didn't help any. But I figured out today the c-clip wasn't fully extending into the groove on the flange. I took a flat head screwdriver and pried around the inside edge of the c-clip and was able to "push" the clip further into the groove. Got it in there nice and tight and have no play now

 

just checked my new hks bov and it has play like yours, ***