"FLUSH BULB IS A ONE PIECE SEMI-SPHERICAL RUBBER-LIKE BALL REINFORCED AT THE TOP; BULB DIA. IS 2-1/2 IN., BULB HEIGHT IS 2-3/8 IN.; BULB HAS THREADED COPPER ALLOY INSERTED AT THE TOP TO RECEIVE LIFT ROD; INSERT IS THREADED IAW ANSI/ASME B1.1 WITH 0.138-32 UNC-2B INT. THREADS 3/8 IN. LENGTH"