The government is procuring 8 units of a check valve, NSN 4820007173718, with delivery to DLA Distribution Depot Oklahoma required within 165 days after date of order. Approved sources are 03990 part 900574 and 04577 part 21136-2. The solicitation is an RFQ available via the provided link; hard copies, specifications, plans, and drawings are not available. All responsible sources may submit quotes electronically, and timely received quotes will be considered.