The Lockwood Hydraulic 3024 Door closer is an adjustable door closer suitable for architectural and commercial applications. With adjustable closing speeds and three mounting options, it can be used with both left and right hand opening doors, both inward and outward opening. 2-4 Power Adjustable. Adjustable Backcheck. Overload Protection. Regular, Parallel and Over Door mounting. Tested on fire door assemblies up to 4 hours, in accordance with Australian Standards.