I have an old Jet 2 hp dust collector that I am converting to two stage. At Oneida's recommendation, I purchased a Super Dust Deputy which has a five inch outlet. I'll be using five inch flex hose. I ordered 25 feet of black flex hose from The Blast Gate Company. The packaged was shipped quickly and arrived in good shape within a few days of the order. But I only received just over 21 feet of hose. I reached out to The Blast Gate Company, and without question or pictures or anything other than an e-mail from me indicating the length of what I received, it agreed to send me five additional feet of hose. This is very good customer service, and I will be loyal to this company. I wanted to pass this on to the forum. By the way, the dust hose is really nice. Very heavy duty.