NIGP 03153: Grilles, Diffusers, Registers, etc.

NIGP 03153 Grilles, Diffusers, Registers, Etc., an Item code, encompasses specialized aeration and diffusion equipment that state and local governments procure for wastewater treatment and water reclamation facilities. Recent solicitations show state and local buyers purchasing diffuser systems, replacement membranes, diffuser accessories, and related components that are essential to aeration basins and ozone treatment processes. The issuing bodies soliciting under this code include municipalities with water and wastewater utilities — the City of Tampa, the City of Orlando, and the City of Plant City, Florida — each managing water treatment and reclamation facilities that depend on proprietary diffuser technology for operational continuity.

Recent activity clusters in Florida and has concentrated on sole-source and single-source procurements, reflecting the specialized and equipment-dependent nature of the work. The City of Tampa issued an intent to single source SANITAIRE diffused aeration equipment and replacement parts from Xylem Water Solutions USA, Inc., with an estimated contract value of $150,000 and a response due July 16, 2026. The City of Plant City, Florida, pursued a notice of intent to sole source wastewater treatment diffusers — including MP3 CPVC diffusers, EPDM replacement membranes, diffuser accessory kits, and stainless steel clamps — from Environmental Dynamics International, with a total contract value of $37,975.00 and a February 10, 2026, deadline. The City of Orlando similarly issued a sole source notice for Flexair Minipanel Diffusers, Model 117-1359, from Environmental Dynamics International, with a response deadline of April 16, 2026. These procurements underscore that vendors in this space typically hold exclusive regional or manufacturer representation and that municipalities rarely conduct competitive bidding once a facility's equipment ecosystem is established.