A trigger head is the part of a spray bottle that wears out first, and a spare one keeps a good bottle in use. This Better Detailing trigger screws onto a 28/410 neck, the 28mm thread used on many detailing spray bottles, and it has a smooth black finish, a wadded EPE seal and a nozzle that turns between spray and off. Each full pull gives about 1.2ml. The clear dip tube is a standard length, so trim it if it reaches past the bottom of your bottle, or fit a longer tube for a taller one. Test it with the product you plan to use, especially strong chemicals, and turn the nozzle to off after use so the bottle stays closed.