Custom Bid for Services- Flushing of Propeller Hub with Inner Tube and Thrust Block to achieve NAS 6, Custom Bid for Services- Flushing of Pipes and associated fittings to achieve NAS 6, Custom Bid for Services- Flushing of header or storage or circulating tanks of CPP to achieve NAS 6, Custom Bid for Services- Flushing of storage or circulating tanks of DE and RG to achieve NAS 9