What is this on my water neck?????

[Gregg72340]

I have no pictures but its an 85 c-10 1/2 ton 305-auto.  On my water neck is two what looks like screw in pieces, one has vaccum lines attached to it, and the other is broken off.  I did find an electrical wire unhooked near by, does anyone know what this broken piece is?

Thanks
Gregg

[VileZambonie]

Spell check and take pix so we can see exactly what you are talking about.

The device with the vacuum hoses is a thermostatic vacuum switching valve. (TVSV)

It's job was to allow or block vacuum depending on temperature. Don't know what you're talking about for the other one unless you can take a pic or describe it better.

[Gregg72340]

The truck is three hours away and I forgot to take a picture of this, I assumed it was some sort of temp sender because i found an electrical connector laying near it, and nothing else is unhooked.  It looks like some sort f sender that has been snapped off, the part is still there that is shsaped for a wrench for you to scew it in, so I guess I will take a pic when I go back in three weeks

[Irish_Alley]

http://www.delbridge.net/vacuum.html
sgtdel took some pics see if you see it in there then tell us what pic and were abouts it is

[Gregg72340]

I looked at those pics.  There are two pieces stickin out of the water neck.  The one that is still on mine is the one that is in those pics.  I will just ahve to get a pic next time I go up and try it then

Thanks