they are blue ones , put fan jet into search box and they will come up. i only use pencil jets on windows -found gardiners to be best. i use fans on conserv roofs , was thinking of trying the wintecs for this . at the moment i use cleantecs , the 2 types they sell are low pressure - for use with bp . and high pressure-
60psi or more pumps. if used with a 100psi the lower pressure ones create a fine mist, the higher pressure ones are not so fine
daz