{"product_id":"eaton-661x4-compression-tube-connector-1-8-inch-fnpt","title":"Eaton 661X4 Compression Tube Connector 1\/8 Inch Fnpt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe EATON 661X4 is a straight compression tube connector designed for joining tubing to female NPT threaded ports in fluid and pneumatic systems. It features a compression inlet on one end and a 1\/8 inch FNPT threaded connection on the other, providing a leak-resistant mechanical seal without soldering or brazing. Constructed from brass, it is rated for a maximum working pressure of 2000 psi and operates across a wide temperature range down to -65 degrees F. Licensed trades including plumbers, HVAC technicians, and instrumentation specialists use this fitting in control tubing runs, instrument lines, and low-volume fluid circuits where reliable sealing at small diameters is required.\u003c\/p\u003e\n\u003cp\u003eThis fitting suits residential and light commercial applications where 1\/8 inch FNPT ports are present, such as pressure sensing lines, pneumatic control circuits, and refrigeration instrument connections. Its compact straight profile at 0.925 inches overall length allows installation in tight spaces. It is sold individually and is appropriate wherever a durable, pressure-rated compression-to-female-NPT transition is needed in a brass-compatible system.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eStraight compression-to-FNPT configuration allows direct connection from tubing to threaded female ports\u003c\/li\u003e\n  \u003cli\u003eBrass construction provides corrosion resistance and compatibility with a wide range of fluids and gases\u003c\/li\u003e\n  \u003cli\u003e2000 psi maximum working pressure supports demanding instrument and control line service\u003c\/li\u003e\n  \u003cli\u003eRated to -65 degrees F minimum temperature for low-temperature service environments\u003c\/li\u003e\n  \u003cli\u003eNPTF thread standard ensures pressure-tight engagement with standard NPT female ports\u003c\/li\u003e\n  \u003cli\u003eCompact 0.925 inch overall length suits confined installation areas\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting for systems requiring a 1\/8 inch compression-to-FNPT straight connector in brass with NPTF thread standard.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed plumber, HVAC technician, or qualified instrumentation mechanic. Depressurize and isolate the system completely before removing or installing any compression fitting. Hand-tighten the compression nut first, then follow the fitting manufacturer's standard procedure for the tubing material being used. Verify all connections are leak-free under system pressure before returning the circuit to service.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Type\u003c\/strong\u003e: Connector\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Connections\u003c\/strong\u003e: Compression x FNPT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/8 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: NPTF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Shape\u003c\/strong\u003e: Straight\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Working Pressure\u003c\/strong\u003e: 2000 psi\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 0.925 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Temperature\u003c\/strong\u003e: -65 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.044 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: EATON\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 661X4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51543904059698,"sku":"661X4","price":15.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/34b72d0f12e648b0ac25757c2eee15ac.jpg?v=1785922326","url":"https:\/\/voomisupply.com\/products\/eaton-661x4-compression-tube-connector-1-8-inch-fnpt","provider":"Voomi Supply","version":"1.0","type":"link"}