AN Fittings

[buns]

I just got some AN fittings to plumb my Demon Carb. There is a small hole, and what looks like a pin inside the hole. Can someone explain the purpose of this?

https://static1.pt-content.com/images/pt/2007/12/anfitting-1.jpg

[ZZ430]

That pin in used on all swivel fittings. It keeps the pieces together.

[buns]

ZZ430...thankyou. Mystery solved!