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Note: These fittings are designed to nominally fit the actual ID of the tubing size indicated. To get the correct size fitting, you must measure the ID of your tubing.
Nominal Fitting Size OD of fitting 1/8"(3mm) 3.5-4mm 5/32" (4mm) 4-4.5mm 3/16" (5mm) 5-5.5mm 1/4" (6mm) 6-7.5mm 5/16" (8mm) 8-9mm 3/8" (10mm) 10-11mm 1/2" (12mm) 11.5-13mm 9/16" (14mm) 14-15mm 5/8" (16mm) 16-17.5mm 11/16" (18mm) 18-19mm 3/4" (20mm) 20-21.5mm 13/16"(22mm) 22-23.5mm 1" (25mm) 24.5-26.5mm 1-1/4" (32mm) 32-34mmNote: The smaller (First) number measures the OD of the flat section of the sleeve on the fitting. The larger (Second) number measures the ribbed portion of the sleeve on the fitting, which is slightly enlarged.
OMT Combo 1/3HP 4CFM Air Vacuum Pump MANIFOLD GAUGE Set HVAC AC Refrigerant Kit
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OMT Combo 3.5CFM 1/4 HP Air Vacuum Pump HVAC Refrigeration AC Manifold Gauge Set
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