1,product is little thing, but express courier still need 1 kg payment at least, it is pay to courier not our, please find out this point. 2, this tiny flange rubber breaks, because you use wrong way to add, for your easy understand, i shoot a video for you. 3,you always says you not use it, it is not your problem, but if you not use it, why after three month, it is breaks, not three days? 4, about guarantee, last order, you say pump plunger breaks, it is not your fault, ask break reasons , you can not answer, you say you not use it. for customer good after service, we are willing to send you a new pump body for free, but you want our side take all duty, why ask for alibaba, they still not judge return your money? do not think about it? how many time you do like this to force factory return money even not their fault, ask alibaba to force supplier return all money, or threaten supplier will write bad comment, i think your are so professional about this way.