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Front view of Febco 905-353 relief valve module for 860/880 RPZ, shows bronze relief valve body and diaphragm assembly for 1/2"–1" sizes.

Febco 905-353 Relief Valve Assembly for 860/880 (1/2"–1")

Brand: Febco
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$379.68
$284.76
SKU 905-353

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Replacement relief valve assembly for FEBCO Series 860 and 880 Reduced Pressure Zone (RPZ) backflow assemblies. Engineered as the service module that controls overpressure discharge, this OEM Febco part provides the critical relief function for 1/2" and 1" RPZ installations. Use when repairing or maintaining FEBCO 860/880 units to restore reliable relief performance.

  • Fits: FEBCO Series 860 and 880 RPZ assemblies, sizes 1/2" and 1".
  • Included components: cover and diaphragm assembly, relief spring, seat ring and gasket—complete relief valve module.
  • Function: hydraulically balanced diaphragm relief valve that opens to discharge when the differential across the first check drops to the relief setpoint.
  • Compatibility: Designed for FEBCO RPZ designs that use NPT (ANSI/ASME B1.20.1) end connections; intended as an OEM replacement module.
  • Service note: In-line serviceable component; follow FEBCO installation and maintenance manuals for inspection, replacement intervals and freeze protection guidance.

This Febco 905-353 module restores the relief valve function of the RPZ assembly and is sold as the relief valve module only — shutoff valves, test cocks and full assembly hardware are not included. Consult the supplied installation and maintenance documentation before installation and have repairs performed by a qualified plumbing technician to ensure code compliance and safe operation.

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Frequently Asked Questions

What assemblies does part 905-353 fit?
Fits FEBCO Series 860 and 880 reduced pressure zone (RPZ) assemblies in 1/2" and 1" sizes.
What components come with this relief valve assembly?
Includes cover and diaphragm assembly, relief spring, seat ring and gasket—complete relief valve module.
Is this an OEM Febco replacement part?
Yes. This is the OEM Febco relief valve module sold under part number 905-353 for 860/880 models.
Can I install this myself or need a pro?
Follow FEBCO installation and maintenance manuals. Repairs should be completed by a qualified plumbing technician to meet codes.