Valve made from two materials and writing utensil with retractable tip incorporating same

A retractable marker, comprising:

• a barrel with an opening;
• a valve disposed in the barrel and comprising a first valve portion made from a first material and a second valve portion made from a second material;
• the first valve portion including a body, a door, and an inner hinge pivotably connecting the body to the door, the body including a first opening at a first end and a second opening at a second end opposite the first end, and a circumferential recess disposed in the second end, wherein the inner hinge pivotably connects the door to the body at the first end;
• the second valve portion including an inner seal disposed in the circumferential recess, the inner seal including a circumferential ridge extending inwardly, and a door seal disposed on the first end of the body;
• an ink reservoir in the barrel;
• and
• a nib subassembly with a writing tip in fluid communication with the reservoir;
• wherein the nib subassembly is slidable between a retracted position in which the writing tip is inside the valve such that the door bears on the door seal and the circumferential ridge bears on the nib subassembly to form a substantially sealed chamber and a writing position where the writing tip is extended out of the opening of the barrel and the door is pivoted away from the door seal.