Connect a 1/4 inch diameter hose to a 3/8 inch diameter hose with this fitting. When coupling hoses together, connect the larger diameter hose to the sprayer and the small diameter hose to the gun for maximum pressure when spraying.
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3/8 x 1/4 MNPT Pipe Thread Brass Air Hose Barb Fitting 10-PackBrand new brass 3/8 air hose barb repair fitting. This connects to 1/4 NPT ends for
10 Pack 3/8 x 1/4 MNPT Pipe Thread Brass Air Hose Barb Fitting For 3/8 Hose
Hose Fitting, 1/4 in x 3/8 in#157350 – Cofield Store
Hose Fitting, 3/8 In X 1/2 In, 43% OFF