... provides PPI, DPI, PSI, LOADING and FULL inspection etc. Hardline such as valve qc insepction of water, gas, and brass, etc. ... samples. CIS provides inspection service is as follow:1. Pre-Production Inspection(PPI)2. During-Productio Inspection(DPI)3. Pre-shipment Inspection(PSI)4. ... water valve, brass valve, and so on. Water valve inspection (valve inspection, gas valve inspection, QC inspection)