You can install it on the high pressure washer hose which is with G1/4 male thread, or install quick connector & plug (option D and E and then install jet nozzles. Working pressure: 4000 PSI Thread: G1/4 Colour:silver+gold Material:Metal Package Contents: 4 x nozzle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.