... steel and tungsten carbide 4. Pump designation: 1) RHAM: Stationary Heavy Wall Barrel, Top Anchor, Mechanic Seating, Rod Pump ... Stationary Heavy Wall Barrel, Bottom Anchor, Mechanic Seating, Rod Pump 3) RHAC: Stationary Heavy Wall Barrel, Top ... Thin Wall Barrel, Bottom Anchor, Soft-packed Plunger, Rod Pump 11) THM: Heavy Wall Barrel, Mechanic Seating, ... Cup Seating, Tubing Pump API 11AX sucker rod pump