UNSPSC 31181705: Seal backup ring

A type of ring having backup holding and sealing action. Back-up rings are washer-like devices that are used to prevent a seal from extruding through any gaps while under pressure. Back-up rings are not seals themselves, but are usually used in conjunction with O-rings in high-pressure applications and are installed in the downstream side of the gland.

UNSPSC 31181705 Seal backup ring is a Commodity code encompassing elastomeric backup rings and related sealing materials used in industrial pumping and infrastructure applications. State and local governments procure these components primarily for maintenance and repair of pump systems, bridge infrastructure, and equipment that requires dynamic or static sealing under pressure. The recent opportunities show issuing bodies spanning county transportation departments, municipal utilities, and statewide cooperative purchasing vehicles serving multiple jurisdictions. The City of Port Orange, Florida and the State of Maine Department of Transportation represent the direct end-users in recent activity, while Sourcewell (a Minnesota cooperative) and smaller county purchasing offices broker access to broader networks of local government entities seeking standardized contracting for equipment-related supplies.

Maine Department of Transportation's RFQ 17A 260427-275, posted May 18, 2026 with a June 1, 2026 response deadline, is the most concrete recent opportunity, establishing a Master Agreement for bridge joint seals and backup materials across multiple seal sizes and supporting products for delivery to nine MaineDOT locations, with an initial contract term through June 30, 2027 and four optional one-year extensions. The City of Port Orange's Notice of Intent to Award SS2620CW, dated September 16, 2026, targets NOV Chemineer Moyno pump products and repair services under a sole-source procurement authority valued at approximately $500,000 annually, though this is a verification notice rather than an open solicitation. Activity concentrates in Maine and Florida with secondary reach through multi-state cooperative frameworks; the geographic spread remains limited, suggesting this is a specialized, low-volume code with purchasing concentrated among transportation departments and utilities managing aging infrastructure or critical equipment requiring manufacturer-specific components.