... Spools, Riser and Diverter Spools in accordance with API 16A Tubing head spool Tubing head spool :Adapter Spools, Spacer Spools, Drilling Spools, Riser and ... Ruiyi manufactured are all in accordance with API 16A SpecificationWork pressure:3000-20000psiMaterial class: AA BB CC DD EE FF HHMain ... ,S,T,UPerformance class:PR1,PR2Production class: PSL1,PSL2,PSL3, tubing spool