What I'm looking for is a Y pipe connector that's 4" on all 3 ends. But what I want would be a upper case "Y", not a lower case "y" that I can connect flexible hose to. I have found a steel dryer vent pipe that might work but I would have to buy it and then confirm that it will. What I would like is a page with every fitting a company makes. It seams like most retailers only sell one of a limited number of brands. I assume that there's a company in China just spitting this stuff out and multiple places just putting in a bag with their name on it. Is there one or two companies that just seam to have more different style fittings than most?