Unfortunately the description does not specify which connector is stage 5. Modern systems use Quick Connect for Stage 5 (and even many older systems, like mine, have been switched to Quick Connect since APEC no longer sells threaded final filters). I've seen the manufacturer answer the question that these filters will work with my filters. specific system. But level 5 is a deprecated multithreaded type and doesn't work with my system. I am keeping them as the price is right but I will have to order another Stage 5 from a different brand. I thought it was worth pointing this out here in the comments as Stage 5 is the only filter that doesn't have the image specified in the manufacturer's description. Maybe I'm being cynical, but I can't help but believe that the omission of the step 5 instructions is intentional, as many system owners are into the Layer 5 quick connect style and wouldn't buy it if it was explicitly stated as the old one would not be referred to as fast type. Connections.
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