vacuum pipe from servo to intake m

Hi all,

The white piece from from the pipe that foes from the brake servo to intake manifold has broken. I was wondering isitjust a T piece or does it have another function.

Also would I need to buy the whole pipe?

It's a non return valve. All should have them. Mine has not at the moment and I have just bought a second hand one from this site to re fit. 

Thanks, did you buy it from crazy quiffs, or a seller on the forum?

Seller on here. There are a load if different sorts that all do a similar job. They pop up on eBay too