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Hi guys. I need your help. I bought a Slingshot wave SST in second hand and when I saw it it was ok. Today I was able to try it. Kite worked perfectly until the time to pack everything and return home. The main/middle strut does not desinflate and then I tried to inflate again and one of the side struts does not inflate. Any suggestions to solve these two problems please?

Open the valves.
If your slingshot kites are like my old ones, the pinch valves on the tubing between PE and struts are probably covered with little neoprene sleeves.
Maybe not obvious if you are used to a different system. You can move the covering and inspect the valves to mke sure they’re really doing what you want - closed to ride, open to pump or deflate.
Or you could switch to strutless kites like i did, no struts no problems....

Sometimes on older kites the one pump tubes get a bit perished and "sticky". So when you clamp them off the inside of the tube sticks to itself and will not let air in or out - depending on when it happens.
Try unclamping the lock off clip on the one pump hoses and then slide the lock off clip along the hose, if the black tube is stuck to itself internally you will see the black tube has a dent in it where the clamp was in contact with it. Squeeze the tube, the tube will open and the air will enter or escape.
If it keeps happening replace the hoses.

Guys thank you for all your help. I will try to follpw your advices. Will give you feedback as soon as I tried to fix the problem.

Problem solved. It was the clamclick that makes the air to circulate from the leading edge bridle to the struts bridles that was locked and was tightening not allowing the air to circulate to the air pipes. It is working perfectly now. Once again thank you very much for your help.