Ifor Williams Controller P11972. The aqua plug for this remote is sold separately - part number P07255 ( please use the search box to find )

This Handset & lead fits the Fenner/SPX power packs for the following tipping trailers before 19.3.2007

TT85
TT105
TT126

For a handset & lead that fits these trailers after this date you will need P11974HS which fits the Fluidlink power pack