diff --git a/tests/tube.scad b/tests/tube.scad
index bba1441..3e8bf5a 100644
--- a/tests/tube.scad
+++ b/tests/tube.scad
@@ -27,6 +27,9 @@ module tubes() {
 
     translate([50, 10])
         tube(10, 8, 30);
+
+    translate([100, 10])
+        rectangular_tube([10, 20, 30]);
 }
 
 tubes();
diff --git a/utils/tube.scad b/utils/tube.scad
index 98417a9..de0ee71 100644
--- a/utils/tube.scad
+++ b/utils/tube.scad
@@ -68,3 +68,11 @@ module woven_tube(or, ir, h, center= true, colour = grey(30), colour2, warp = 2,
         }
     }
 }
+
+module rectangular_tube(size, center = true, thickness = 1, fillet = 0.5) {
+    extrude_if(size.z, center = center)
+        difference() {
+            rounded_square([size.x, size.y], fillet);
+            rounded_square([size.x - 2 * thickness, size.y - 2 * thickness], fillet);
+        }
+}