Wilkins 4" 450ST/450STDA 1st or 2nd Check Assembly

Wilkins: RK4-450STCK4 - 4" First or Second Check Assembly for 450ST/450STDA

• 1st or 2nd Check: 450ST Double Check Assembly

• 1st Check: 450STDA Double Check Detector Assembly

• 2nd Check: 475ST Reduced Pressure Zone Assembly

Kit Includes: Check Module and Retainer Clip