NSN 4210-00-552-3818, 4210005523818
SIAMESE CONNECTION,FIRE HOSE

Federal Supply Classification: FSC 4210 - Fire Fighting Equipment
National Item Identification Number: NIIN 005523818
Codification Country: United States
Item Name Code: INC 03500
Criticality: (X) This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.
Hazardous Material Indicator Code: (P) There is no information in the HMIRS; however, the NSN is in an FSC in Table II of Federal Standard 313 and an MSDS may be required by the user. The requirement for an MSDS is dependent on a hazard determination of the supplier or the intended end use of the product.

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DLMS^® Summary

National Stock Number 4210-00-552-3818

National Stock Number (NSN) 4210-00-552-3818, or NIIN 005523818, (siamese connection,fire hose) was assigned October 24, 1974 in the Federal Logistics Information System (FLIS). This NSN does not replace any other NSNs.

There are 6 manufacturer part numbers associated with this NSN. 2 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 4 suppliers. Today, 4 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 2 suppliers are deemed design controlled or valid supply parts. ISO Group has several sources of supply for this NSN.

This part number has not been procured by the US Government in over 5 years.

This NSN is somewhat common among different platforms, belonging to 2 different weapons systems.

There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Aug 24, 2020, this NSN's acquisition method was noted as: Suitable for Competitive Acquisition. (Potential sources shall include dealers/distributors.) The Government has unlimited rights to the technical data, and the data package is complete. Valid AMCs: 1 and 2.

This NSN is assigned to Item Name Code (INC) 03500. [A CONNECTION DESIGNED FOR UNITING TWO OR MORE FIRE HOSE LINES TO INCRESE THE VOLUME OF DISCHARGE, OR FOR DIVIDING A FIRE HOSE LINE TO INCREASE THE NUMBER OF OUTLETS. END CONNECTIONS MAY INCLUDE INTEGRAL VALVES, BALL, CLAPPER, PLUG AND THE LIKE.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no information in the HMIRS; however, the NSN is in an FSC in Table II of Federal Standard 313 and an MSDS may be required by the user. The requirement for an MSDS is dependent on a hazard determination of the supplier or the intended end use of the product. NSN 4210005523818 contains an unknown precious metal.

This information was last updated on Aug 01, 2025.