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Swapping a Grundfos MQ 3-35 or 3-45 with a SCALA1 3-45 is simple. Simply use a 1" Stainless Steel Flex Hose on the pump's discharge, and bend the house to match up to your existing plumbing. 1" SS Flex Hoses are available on our site in 12", 18", 24", 36" and 48" lengths.