Model Description MS-2-18-2-12-3-C-P-E-TD 1 2 3 4 5 6 7 8 9 10 1.MS: Model Series 2.A Filter Element Length: 20 inches 3.A Filter Element Number: 18PCS 4.B Filter Element Length: 20 inches 5.B Filter Element Number: 12PCS 6.Pump Motor: 3HP (or 1HP, 2HP etc.) 7.Filter Medium Type: T-Filter Tube With Screw Nut, C-Filter Element With Pressure Plate, B-Filter Element With Screw Nut, P-Filter Paper, K- Carambola Shape Cloth 8.Pump Material: F-FRPP, P-PVDF 9.O-Ring Material: E-EPT, V-VITON, N-NBR 10.Pump Model: TD Series, or TCH Series