Our gum rubber air hose is typically used along with a pneumatic or air wave switch to build an air activated sensing edge. We stock 3/8, 1/2, 3/4 inch inside diameter (I.D.) sizes. You may also be interested in: PS-20 pneumatic switch in NEMA4 enclosure AW-10 air wave switch only AW-12 air wave switch in NEMA4x enclosure AW-14 air wave switch in ABS enclosure