Does all OEM´s manufacture their rubber products (gaskets, rubber spools, port rings, transition rings etc)?
Well, actually it´s rare. Most OEM´s have designed the products themselves, but let rubber factories manufacture the products. There are exceptions, but not many. There are OEM´s who do manufacture their own gaskets, but then they also buy from other manufacturers as well. So they may have many suppliers, which of course affects the quality. The quality is ALWAYS different for different suppliers, even when they produce for the same specification. The quality may be better, or worse, but it´s always different. For many applications it may not be of importance, but for some applications it does matter.
