Hello, I'm a developing a new product and I would like to test this product, medical air valves for medical bed mattress. So I would like to buy a small quantity, about 20. Can you give me a direct contact. I would like to get more information about your product and also ask you if you can provide me an invoice. I am aware that is a very small quantity, but I really need an invoice, even if the price have to be adjusted... Just please contact me, my mail address is . Thank you very much! best regards, Joana Fonseca Show More