Profile: TRD Mfg., Inc. manufactures NFPA-interchangeable cylinders. Our products include TA series NFPA, TR series non-rotating, MSE/MSR multi-stage, EN electroless nickel plated, NR series non-rotating and SS series stainless steel cylinders. Our 2-stage telescoping cylinder features 1-1/2" effective bore size, strokes up to 60″, 100% double acting and rated for non-lube service.