This is a legacy product. Please contact us for the latest version.sales@ocaire.com, CYL, STOPPER, NPT PORT, ACTUATOR, RSQ/RSA MISC/SPECIALIZED, NS, 50MM RSQ SINGLE-ACTING, 2.64294 lb, SeriesDescriptionModelActionNoteVol. no. (for std model)RSQStopper cylinderRSQDouble acting--101010