This is a legacy product. Please contact us for the latest version.sales@ocaire.com, CYL, STOPPER, NPT PORT, ACTUATOR, RSQ/RSA MISC/SPECIALIZED, MD, 40MM RSQ DOUBLE-ACTING, 1.89597 lb, SeriesDescriptionModelActionNoteVol. no. (for std model)RSQStopper cylinderRSQDouble acting--101010