3/8'BSP X Quick connect (Maxi ) These quick connects come in three different sizes .
1/4' This is the quick connect nozzle size
3/8' This is found on Pressure washer hoses
1/2' This is found on Pressure washer Hoses Notably Honda pressure washers
They are also Known as Mini/Midi/Maxi. Study picture carefully and make sure this is the right one before ordering