keg coupler check valve

[n8huntsman]

I'm ordering a taprite coupler. I noticed that they sell an extra little check valve that goes on the beer side. I didn't even know there was a check valve that went in the couplers. I have no idea if any of my others have them.

Is this needed if my gas distribution manifold already has check valves built in?

 

[argentcorvid]

It's so that the beer doesn't drain out of your line and go everywhere when you disconnect the coupler. on the ones I have, It's just a ball inside the probe that covers the hole when flow tries to go backward.