Image 1 of 1 P-215 US$5.00 Natural Tefzel 1/4 28 Nut for 1/16” tubing. Requires ferrule such as P 200N.Catalogue # P-215 Quantity: Add To Cart Added! Natural Tefzel 1/4 28 Nut for 1/16” tubing. Requires ferrule such as P 200N.Catalogue # P-215