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Model 3030/3130Non handedSized spring (3030: 2-4; 3130: 2-3)Concealed in door3-valve speed adjustment3030: Regular arm mount3130: Track arm applicationIdentified by # stamped on mounting bracket or at closer shaft

Model 2010/2011Handed2010: Adjustable 2-62011: Adjustable 1-6Track arm applicationIdentified by # near shaft

Model 5010/5011Handed5010: Adjustable 2-65011: Adjustable 1-6Regular arm applicationIdentified by # near shaft

Model 2030HandedSized spring (1-6)Track arm applicationIdentified by # stamped on closer body opposite of shaft or by the size of door

Model 5030HandedSized spring (1-6)Regular arm applicationIdentified by # stamped on closer body opposite of shaft or by the size of door