18 quid expensive not realy mine has lasted 6 years and used regular its supposed to be 3mm and I just checked it and its now 3.5mm so it aint worn much in all that time my 6.0mm jets supposed to be about 7o quid and I scored a few for £20
minimum of 75 cfm I run mine at 90 cfm and comp runs at full whack till I introduce the grit and it slightly slows down
you need to reduce the flow of media to the blast jet or it will clog up and flood the hose. they all do
