Sui Northern Gas Pipelines Limited invites sealed bids from original manufacturers, authorized distributors, dealers, and suppliers registered with Income Tax and Sales Tax Departments. The procurement is for the supply of screwed fittings, comprising 17 items with a total quantity of 184 units. Bidders must possess a valid Professional Tax Clearance Certificate and be active taxpayers with the Federal Board of Revenue. The tender documents require a submission of Rs 2,500 in the form of Pay Order or Demand Draft along with proof of active taxpayer status and valid tax certificate.