John Dow Industries DOW20DCE-3 4" Heavy Duty Swivel Caster Fits drains DOWJDI-15DP DOWJDI-16DC-E DOWJDI-20EV DOWJDI-20DC-E DOWJDI-20DC-EA DOWJDI-20COMBO DOWJDI-COMBO-B DOWJDI-25HDC and DOWJDI-3726