Quick Connection Fitting ¼ inch for Easy Connection. Depending in your needs,You can fill a wide range of particulate filter(Tourmaline,Resin filter,Mineralization ball and so on) Color:blue + transparent Material:ABS Shell size is in a position 25 Package Contents: 1*Household pre-filtration Only the above kit content, diversified merchandise usually are not included. Note: Light shooting and varied reveals can cause the colour of the article within the photo a bit of varied from the genuine thing. The dimension allowed error is +/- 1-3cm.