Catalyst offers a full line of API and non-API sucker rod pump seating assemblies. Seating assemblies, mandrels, and hold-down components are manufactured to the same strict quality standards associated with the Catalyst brand.


  • API S11 (Type HR Rod Pump)
  • API S17 (Type HR Tubing Pump)
  • API S21 (Mechanical Top Lock)
  • API S22 (Mechanical Bottom Lock)
  • API S31 (Type O)

Material Options:

  • 8620 Alloy Steel
  • Brass
  • 316 Stainless Steel

*Catalyst offers tailored configurations upon request.