16mm 19mm 22mm Push Button Waterproof Plastic Switch Cover - China Metal Switch, Push Button Switch | Made-in-China.com
White Square Transparent PC Waterproof Cover 19mm Mounting Panel Push Button Switch Cap Not with Switch - China 19mm Push Button Switch Cap, 19mm Push Button Cap | Made-in-China.com
61-9922.0 EAO | EAO Transparent Push Button Flip Guard for Use with Series 61 Switches, 30 x 24mm | 176-0226 | RS Components
Push Button Switch Protective Cover Protective Cover Anti-missing Elevator Emergency Stop 22/30mm Accessory Round Warning Ring | Fruugo PT
9001K60 Square D By Schneider Electric, Assembly Hardware, 30mm Push Button Switches, Cover | Farnell UK