What part is this?

[irvinc10]

It's on a 78 c10
Not sure what it is and what it does
It's right next to the brake booster

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[legopnuematic]

Windshield wiper motor..

 

[1987 GMC Jimmy]

Also your washer pump appears to be disconnected.

 

[irvinc10]

Thanks guys, made me feel dumb.
Also it doesn't have a reservoir...

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[Charlie]

 

[smoothandlow84]

The oem plastic resevoir tank is usually mounted to the inner drivers side front fender on the fenderwell tub