The new sleeve master cylinder takes the comfort of your pumping one step further. The special opening of the cylinder will fit right in to the high quality special design sleeve which provides you with better suction and more comfortable grip. Available cylinder sizes are 2", 2 1/4" 2 1/2" The sleeve base diameter is 2" but it will stretch between 2" to 2 1/2" is available separately in the accessories catagory. 30 Days Manufacturer Defect Warranty. PUMP SOLD SEPARATELY