sucker rod pump as per  API 11X

1. size:
20-125,25-150,25-200,30-250
2. Type of barrel: Chrome plated or carbonitrided surface
3.Type of plunger: Metal spray or chrome plated surface
4.Valve ball and seat materials: Stainless steel and tungsten carbide.
5.Pump designation:
1) RHAM: Stationary Heavy Wall Barrel, Top Anchor, Mechanic Seating, Rod Pump
2) RHBM: Stationary Heavy Wall Barrel, Bottom Anchor, Mechanic Seating, Rod Pump
3) RHAC: Stationary Heavy Wall Barrel, Top Anchor, Cup Seating, Rod Pump
4) RHBC: Stationary Heavy Wall Barrel, Bottom Anchor, Cup Seating, Rod Pump
5) RHT: Traveling Heavy Wall Barrel, Bottom Anchor, Rod Pump
6) RWA: Stationary Thin Wall Barrel, Top Anchor, Rod Pump
7) RWB: Stationary Thin Wall Barrel, Bottom Anchor, Rod Pump
8) RWT: Traveling Thin Wall Barrel, Bottom Anchor, Rod Pump
9) RSA: Stationary Thin Wall Barrel, Top Anchor, Soft-packed Plunger, Rod Pump
10) RSB: Stationary Thin Wall Barrel, Bottom Anchor, Soft-packed Plunger, Rod Pump