1. API certificate 2.Tubing size:15-40 in. OD 3.Pump bore: 125-375 4.Barrel length:8-30ft 5.Plunger length ... . Valve ball and seat materials: stainless steel and tungsten carbide 4. Pump designation: 1) RHAM: Stationary Heavy Wall Barrel, Top Anchor ... : Stationary Heavy Wall Barrel, Top Anchor, Cup Seating, Rod Pump 4) RHBC: Stationary Heavy Wall Barrel, Bottom Anchor, Cup Seating, Rod ...