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The manhole insert shall be manufactured from corrosion-proof material sutiable for atmospheres containing hydrogen sulfide Features: • Eliminates water run-off from entering sewer collection systems at the manholes. • Keeps dirt and debris out of sewer collection system and controls sewer odors. • Excellent for electrical and telecommunication manholes. • Manufactured of high density, high molecular weight polyethylene, which emininates brittleness, caused by cold temperatures. • Ten year guarantee gainst manufacturer defects (does not cover valve, handle or gasket). • Ventilation by valve or vent hole and no corrosive parts. • Certified engineering reports from Southwest Reserach Institute available upon request. The manhole insert shall be manufactured from corrosion-proof material sutiable for atmospheres containing hydrogen sulfide and diluted sulfuric acid and other gasses associated with waste water collection systems. Item #: 003 Description: Knutson Manhole Inserts JC Utilities Sales, Inc., 9656 Liptonshire, Dallas, TX 75238. Tel: 214-340-7866; Fax: 214-343-7105.