Choose a down tube to match your container size.  All down tubes have a 30° cut end.  
    
        
            | PM2 3:1 |  | 14" - 16 Gallon tank | 
        
            | 3/4" NPT(M) |  | 26" - 55 Gallon tank | 
        
            | PM2 1:1, PM4 3:1 & 5:1, PM35 8:1 |  | 32" - 275 Gallon tote | 
        
            | 1" NPT(M) |  | 60" - 330 Gallon tank | 
        
            | PM35 5:1, PM45 10:1 |  |  | 
        
            | 1 1/2" NPT(M) |  |  |