... API Spec 6A, PSL2, DD, P U, PR1. Slip-type casing hangers; Mandrel style casing hangers. C-22 casing spools feature a ... from wedging under pressure.Manufacturing Standard:API Spec 6A, PSL2, DD, P U, PR1.Outlets:Line Pipe Outlets;Studded Side Outlets ... lock-screws for mandrel casing hanger and packoff retention. C-22 casing spools