Wilkins: 2 1/2″ – 4″ – Second Check Module with Retainer Clips for a:  350A / 350ADA Double Check Detector Assembly / 375A {OR} 4″ 350 DC / 375 Reduced Pressure Zone Assembly
 
     • 2½” – 4″: 350A / 350ADA / 375A
     • 4″: 350 / 375
 

(Previously 3509-300B)

 
Kit Includes:
2nd Check Module and 2 Retainer Clips