Sprayer roller pumps?

[Leejohn]

Can someone tell me if a roller pump is self primering or need head pressure all the time? The ones used on sprayers.

 

[koamfps]

Yes they are self priming

 

[Qapla]

They are also usually located below the level of the tank outlet they are connected to so getting liquid to prime should not be a problem.

 

[Leejohn]

Thanks for info you guys.