A device 307 for resisting rotation of a tap (4, figure 1) that has been fitted to a sink, the device comprising an engagement formation 313 for engaging with a part of the tap and a body 312. The device 307 comprises at least one distal edge 308 for contacting with a remote part of the sink. The distal edge of the device may be configured to abut a downwardly depending part of the sink. Additionally, in another embodiment the device comprises a body with first and second engagement formations for engaging with first and second taps respectively. Also disclosed is a method of installing the device on a tap.