GRUNDFOS - HOT WATER RECIRCULATION SYSTEMS Braided Flex Hose Kit 1/2" NPT - 599390

The Grundfos 599390 Braided Flex Hose Kit includes two 12-inch braided stainless steel flexible hoses with 1/2 in FNPS female swivel connections on both ends, designed specifically for Grundfos COMFORT hot water recirculation systems. Used with the UP15-10SU7P/TLC and other compatible COMFORT retrofit systems, the hoses connect the under-sink COMFORT Valve to the fixture's hot- and cold-water supply lines, providing a flexible, corrosion-resistant, and leak-resistant connection that simplifies installation in confined cabinet spaces while supporting efficient hot water recirculation in homes without a dedicated return line.

Cross References

• Grundfos 599390 — Standard manufacturer part number
• Grundfos 00599390 — Alternate expanded manufacturer number used by some distributors
• Grundfos 595916 — COMFORT System Kit (includes pump, COMFORT Valve and this hose kit)
• Grundfos 99452459 — COMFORT Digital Timer System Kit (includes these hoses)
• Grundfos 595926 — COMFORT Valve (used together with the hose kit)

Usage

The Grundfos 599390 hose kit is installed beneath the sink in a Grundfos COMFORT hot water recirculation system that operates without a dedicated return line. The hoses connect the thermostatic COMFORT Valve to the fixture's hot- and cold-water supply lines, allowing cooled water in the hot-water line to circulate back through the cold-water piping until hot water reaches the fixture.

Their flexible construction simplifies installation in tight cabinet spaces while reducing stress on plumbing connections. Water should be shut off and system pressure relieved before installation, and all connections should be checked carefully for leaks once the water supply is restored.