The first and, in some instances, the second digits indicate the mounting arrangement and relief valve (RV). 

• 1 = Foot mounted, No RV
• 2 = Foot mounted with RV
• 17 = Flange mounted, No RV
• 18 = Flange mounted with RV
• 25 = Baseplate mounted, No RV
• 26 = Baseplate mounted with RV
• 33 = Close Coupled, No RV
• 34 = Close coupled with RV 

The next digit indicates F series: F 

The next two or three digits indicate the approximate theoretical displacement in US gallons per 100 revolutions [Liters/100 rev]. 

• F1 = .00086 GPR (3.2 CC/REV)
• F3 = .002 GPR (7.6 CC/REV)
• F5 = .003 GPR (11.4 CC/REV)
• F10 = .007 GPR (26.5 CC/REV)
• F15 = .0103 GPR (39.0 CC/REV)
• F20 = .0124 GPR (46.9 CC/REV)
• F35 = .034 GPR (128.7 CC/REV)
• F50 = .050 GPR (189.3 CC/REV)
• F75 = .075 GPR (283.9 CC/REV)
• F100 = .0107 GPR (405.0 CC/REV)
• F150 = .186 GPR (704.1 CC/REV)
• F200 = .232 GPR (878.2 CC/REV) 

The next letter indicates the direction of rotation and shaft position. All rotations are facing the drive shaft end. Not all rotations are available for all sizes. CW = clockwise rotation; CCW = counterclockwise rotation. 

High Drive: 

• No letter or W = CW (standard for most sizes) 
• X = CCW 

Occasionally, special pumps or configurations are required which are unique for a particular application. These modifications are clarified by a SPECification number. Identification of any items different than a standard pump can be made by consulting Roper Pump Company or an authorized distributor. 

• Spec 0 – Mechanical Seal, Tapped Ports
• Spec 5 – Packed Box, Tapped Ports
• Spec 17 – Mechanical Seal, Flanged Ports
• Spec 174 – Packed Box, Flanged Ports 

The TYPE number is a number used by Roper Pump Company for in-house identification of construction. Always include the type number in any references to the pump. 

• A = low pressure spring (standard) 
• B = high pressure spring  
• C = high pressure spring (standard)

The SERIAL number is a unique number assigned to each pump built by Roper Pump Company. 

In any communication concerning this pump, always be sure to include the Figure, Spec, Serial, and Type numbers so proper identification of the pump can be assured.