SUR-FIT Natura Two-Piece Durahesive Skin Barrier. The plastic coupling ring allows the pouch and skin barrier to snap together for audible security. Ideal for stomas where the output is mostly liquid. Unlike other skin barriers that can breakdown around liquid output, durahesive® skin barriers swell up or turtleneck to further protect the stoma and peristomal skin. Cut-to-Fit, Durahesive® Flexible Skin Barrier; no tape collar. Size: 1-1/2" Flange, Overall Dimensions: 4" x 4". 10/box.