The filter set was standard and working properly. Came quickly too. However, the 4th stage filter requires connectors (supplied) for plug-in connections. After I installed and tightened it, the fittings on this 4th stage filter leaked. Plugs came without O-rings. However, this is easily remedied with a trip to Homedepot. Because of the problems they cause, I wouldn't recommend buying them if you have push connections.
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