The Rds Cylinder Operates With A Double Ring Piston Set And Has A Stroke Length Of 360mm. The Stainless Steel Tube Is Longer Than The Standard Cylinder. Rod Supports And The Unique Jooste Foot Valve Is Fitted To The Rds Models. A Rust Retainer Is Fitted On The Galvanised Rod, Before The Cylinder, Preventing Rust Or Sand From Settling In The Cylinder.