e following is a detailed of the product 1) Product name: Pressure tank rubber liner (2) Volume: 19L To 24L This volume refers to the volume of the pressure tank, not the volume of this product. (3) After replacing the new bladder, you need to add a certain air pressure to the top of the pressure tank to use it. If it is used without inflation, the water pressure may rupture the product. (4) This product can keep the water pressure stable in the pressure tank, can reduce the frequent start and stop of the water pump, and stabilize the service life of the water pump. (5) This product can be used in diaphragm bladder tanks, as the bladder of pressure tanks. Both horizontal and vertical tanks can be used. The following is a reference for pressure tank dimensions Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.