This tender is for the supply of domestic gas service regulators, specifically 1/2 inch self-operated small gas regulators with tamper-proof set points. The regulators are to be delivered in new condition, packed in corrugated cartons as per specifications. The procurement is intended for monthly delivery of 20,000 units after purchase order placement for compliant bidders. The tender follows a single stage one envelope bidding procedure under PPRA rules 2004, and is open only to pre-qualified vendors active in the FBR Active Tax Payer List.