supply of perforated centre tube (spiral type) to manufacture low mean pore size large secondary fuel oil filter to rdso drg.skdp-3930,alt. nil and conforming to rdso spec.no.mp.0.2600.25,rev. 01, july,2021 note: all the materials parts must be packed in rigid hard card board carton boxes convenient to handle.25perforated centre tube (spiral type) to manufacture low mean pore size large secondary fuel oil filter to rdso drg.skdp-3930,alt. nil and conforming to rdso spec.no.mp.0.2600.25,rev. 01, july,2021 note: all the materials parts must be packed in rigid hard card board carton boxes convenient to handle.25,perforated centre tube (spiral type) to manufacture low mean pore size large secondary fuel oil filter to rdso drg.skdp-3930,alt. nil and conforming to rdso spec.no.mp.0.2600.25,rev. 01, july,2021 note: all the materials parts must be packed in rigid hard card board carton boxes convenient to handle.25 [ warranty period: 30 months after the date of delivery ]