Hawa Engineers Ltd. Supplies Duplex Basket Filter Type Strainer. Hawa Engineers Ltd. Has obtained an ISO 9001 certification. Duplex Basket Filter Type Strainer is connected with a pair of three-way ball valve with a common single handle makes a duplex basket filter. Duplex Basket Filter Type Strainer is available in fabricated and cast construction called as pot strainers or bucket strainer. Filters manufactured up to 48" NB size and filtration down up to 5 micron. Low press drop, large dirt holding capacity, ease & low cost of maintenance are some special features of these filters.