NL303 Teat cannula with adjustable nut

short, narrow, 1 inch diameter round-pointed metal tube used to pass from the exterior, through the teat canal and into the teat cistern.

Used to relieve pressure in the gland when the teat canal is obstructed.

Well-designed ones have a bulge followed by a constriction near the hub so that the tube is self-retaining.

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