annual repair maintenance of 2020-21 sh supply of spares for water cooler cum purifiers at tirupati airport . , supply of following consumables suitable for eureka forbes aquaguard make 80/60 lph capacity purechill ro 7 stage storage cooler cum purifier etc . complete as required . , ro membrane of make filmtec ( dow ) or equivalent . , supply of following consumables suitable for crossfield make 80/60 lph capacity 7 stage ro storage cooler cum purifier etc . complete as required . , 10 carbon block , 11 post carbon filter , ro membrane of make filmtec ( dow ) or equivalent . , supply of ac - dc adaptor suitable for operation on 230+/-10% v , 50 hz ac input supply capable of providing 48v dc , 2a , 96w output suitable for installation on water fountains connected to ro water purifiers etc . complete as required . , supply of ac - dc converter suitable for operation on 230+/-10% v , 50 hz ac input supply capable of providing dual dc output i . e . 24v and 48v dc suitable for installation on eurekaforbes/crossfield make 7 stage ro water cooler cum purifiers etc . complete as required . , supply of 48 vdc ro booster pump suitable for installation in all types of 7stage ro water cooler cum purifiers/fountains etc . complete as required . make: kemflo model : hf1800 . , supply of 4 x 20 jumbo threaded filter suitable for installation in the existing housing bowl of eurekaforbes/crossfield make 7 stage ro water cooler cum purifiers etc . complete as required . , supply of dual o ring pre filter housing suitable for installation in the existing eurekaforbes make 7 stage ro water cooler cum purifiers etc . complete as required . , supply of four way controller connector suitable for installation in the existing eureka forbes/crossfield make 7 stage ro water cooler cum purifiers etc . complete as required . , suppy of steel fountain tap suitable for water cooler fountains installed at tirupati airport . make: innovative aqua solutions or equivalent . , supply of 4 x 20 jumbo big blue pre filter housing ( i . d 16 cm & o . d 18cm ) suitable for installation in the existing crossfield make 7 stage ro water cooler cum purifiers etc . complete as required . , supply of plastic ro flow restrictor 450 suitable for installation in the existing eureka forbes/crossfield make 7 stage ro water cooler cum purifiers etc . complete as required .