Diaphragm Screw, Compatible with Grainger Part Number 6CCR4, 6CCR5, Compatible with Manufacturer Model Number PD20P-FPS-PAA, PD20P-FPS-PTT, Product Type Screw, Diaphragm, Polypropylene, Compatible with Pump Type Diaphragm Pump, Compatible with Series Expert-Series, Compatible with Brand ARO.