UNSPSC 31411800: Diaphragm seals

Isolation devices used to separate pressure instruments from the process media, while allowing the instruments to sense the process pressure

UNSPSC 31411800 Diaphragm seals, a Class code, encompasses elastomeric and elastomer-composite seals designed to flex and compress for pipeline, equipment, and infrastructure joint applications where state and local buyers source them primarily through master agreements tied to specific capital maintenance programs. The recent state and local opportunities show minimal direct activity under this code; however, the State of Maine Department of Transportation's May 2026 RFQ 17A 260427-275 for bridge joint seals and related materials represents the most concrete solicitation evidence, seeking compression seals, silicone coated foam seals, and gland seals in multiple sizes alongside supporting adhesives, sealants, and transition materials for nine MaineDOT delivery locations across five regions. State agencies and transportation departments appear to be the primary buyers at the code level, with school districts, county governments, and municipalities procuring automotive and fleet-related supplies and services under adjacent codes rather than diaphragm seals specifically. The remaining opportunities in the source block—a Williamson County Purchasing relocation notice, a Sourcewell law enforcement cooperative, a Brevard County fleet inventory management solicitation, an Atlanta heavy-duty trailers procurement, and a Sarasota County school automotive parts agreement—fall outside the diaphragm seals scope and signal that this particular Class code generates limited recent state and local procurement volume.

The geographic spread is narrow and concentrated: Maine shows confirmed activity through the MDOT RFQ closing June 1, 2026, with the resulting Master Agreement running from June 15, 2026 through June 30, 2027 and renewable for four optional one-year extensions through 2031. The Maine procurement specifies FOB Destination pricing, delivery to nine MaineDOT locations, manufacturer's original containers, and equivalency documentation for alternative products, with one award to the lowest qualified bidder. Beyond Maine, the source does not support confirmed diaphragm seal solicitations from other states or jurisdictions in the recent-opportunities block. The code appears inactive or lightly used across most state and local procurement offices, with master agreement structures such as Maine's being the exception rather than the norm in current activity.