Why a 3/8 NPT female thread doesn't fit a 3/8 NPT male thread? : r/Plumbing

$ 29.50

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Why are both of these 1/4” but it doesn't fit? The white piece is too big for the hose to screw on. : r/Plumbing

4PCS Aluminum AN6 1/4'' NPT Male to 3/8 Hose Barb Straight Adapter Fitting BK

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in Plumbing.

Legines 1/2 NPT Female to 3/8 NPT Male Reducing Pipe Adapter Brass Reducer Coupling Fitting 1200psi High Pressure (Pack of 2)

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Product Features Part # : 110-CA Thread : 3/8 NPT Male Thread : 1/8 NPT Female Material: Brass Type: Reducer Bushing Product Description IMPORTANT

FasParts 3/8 NPT Male NPT MIP MPT x 1/8 NPT Female FIP FPT Reducer Bushing Brass Fitting Fuel/Air/Water/Boat/Gas/Oil WOG

Replacement Low-Profile 3/8-Inch UNC Nut

Why a 3/8 NPT female thread doesn't fit a 3/8 NPT male thread? : r/ Plumbing

NPT Male Thread , BSPP Female Thread Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Operating

NPT Male to G Female Adapter Pipe Fitting Adapter 3/8 NPT Male x G 3/8 BSPP Female