We will gladly process returns of unused conversion kits or accessories within 1 year of your original date of purchase. You must contact our customer service department to receive a Returned Goods Authorization (RGA) before returning. You must return the goods with the RGA number clearly marked on the outside of the return packaging. Any items returned without an RGA are subject to refusal and loss of credit or refund. All returns are subject to a 15% restocking fee. The shipping charges from the original order are non refundable. Custom Length Hoses, Generators or electronic components/devices are non returnable.