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An insect growth regulator (IGR) is a substance (chemical) that inhibits the life cycle of an insect. IGRs are typically used to control populations of harmful pests, such as cockroaches or fleas.dvantages [edit]. Many IGRs are labeled reduced risk by the Environmental Protection Agency, meaning that they target juvenile harmful insect populations while causing less detrimental effects to beneficial insects.
An Exhaust Gas Recirculation (EGR) valve is a mechanical component found on automobiles and plays an integral part in the proper functioning of gasoline and diesel-engined cars.It ensures that the car burns its fuel effectively by recirculating the emissions from the exhaust through the carâs combustion system.n EGR valve reduces the quantity of harmful car emissions. A faulty EGR valve may result in a stalled car. An EGR valve. An issue with an EGR valve is often identified through reading the car's diagnostic trouble codes.