2 gallon capacity9 1/2 inch wide x 15 inch heightLid has check balls to reduce milk overflow.Use to milk out an infected or injured quarter without interfering with full machine milk-out of the other quarters.Quarter milkers are recommended in cases of high somatic cell count (SCC), injury, mastitis, or hemorrhage. SS Quarter Milker is the dairyman's assurance that affected milk is kept out of the milking system. When used properly, bulk tank bacteria and somatic cell count may be reduced by preventing affected milk from mixing with good milk.