The Sargent 1431-P9-DA-TB Door Closer Powerglide is Delayed Action and Features a Standard Parallel Arm, Comes with Thru Bolts, Is a Commercial Closer Surface Mounted Heavy Duty Door Closer. 1431 P9 TB - Standard Parallel Arm, Forged Steel Arm 11-1/4" (286mm) long Non-handed.This Closer IS Certified ANSI/BHMA A156.4 Grade 1 UL 10C listed for positive pressure fire test UL / cUL listed for use on fire-rated doors, 1431 P9 Door Closer Is Ideal For Use In Heavy Traffic Ares, Institutions, Meets ADA requirements in all applications, except Push Side Track application.