Please note: This is a Sole Source Notification. 15 EA Pump Diaphragm & Valve (AP-SERIES/UV21); 3 EA AA057QD01--T2,APNA-370; Horiba Instruments Incorporated is the maker for these Instruments. The parts that are proposed to purchasing can only be used on the Horiba instruments and can only be supplied by Horiba Instruments, in order to keep the US. EPA as a Equivalent Method Analyzer with Federal Equivalent Method Designation Number EQOA-0506-160. Without this designation all data collected by the instruments will be invalided. The parts that are proposed to purchasing can only be used on the Horiba instruments and can only be supplied by Horiba Instruments, in order to keep the US. EPA as a Equivalent Method Analyzer with Federal Equivalent Method Designation Number EQOA-0506-160. Without this designation all data collected by the instruments will be invalid and jeopardize Federal NAAQS status and impact the regulated industrial sectors as well as Federal Grant funding.