This pack of 2 x 19mm & 2 x 22mm Petrol fuel primers are perfect for those who own chainsaws, Strimmers. hedge trimmers & other garden power tools. These primers are designed to ensure that your engine runs smoothly and efficiently, making them a must-have for any gardener who wants to keep their tools in top shape. Please note 19mm & 22mm are the size of the flange which sits under metal plate.