The Wolverine Brand Manhole Odor Insert from Simple Solutions Distributing is custom-made to exact dimensions to ensure a quality installation and trouble-free operation. Each insert is designed for easy installation and years of trouble-free service. It is available with an optional hydrogen sulfide saturation indicator sticker that monitors for saturation and end-of-service life of the filter media. Each is manufactured from a durable high-density polyethylene copolymer material that meets ASTM Specification Designation D-1248 Class A, Category 5, Type III. The carbon canister is manufactured from PVC and corrosion-resistant components. 866/667-8465; www.industrialodorcontrol.com.