The replacement kite bladders comes with pre-welded valves e.g. fully assembled, ready to install, like the ones installed in your kite. You don't need to buy valves, you just need to install it into the kite and go flying! Our aftermarket replacement bladders are custom made in our factory, with the premium quality TPU made in EU. If we do not have the measures for your kite, when you want exact copy - please send us your broken bladder or fill out the online form and we will make you a replacement one. We offer custom and OEM service to our partners.