The Miller Edge 218-27-18 is a 3/32 in. x 3/32 in. barbed elbow connector for air-line connections in Air-Wave and pneumatic sensing edge systems. It is the fitting that joins the switch tubing to a holed air hose plug, usually P-50H on 3/8 in. or 1/2 in. hose assemblies and P-75H on 3/4 in. hose assemblies. Because this connector sits in the pressure path, a damaged or loose elbow can cause intermittent edge response, air leakage, or poor switch activation.
If the edge activates only when the hose is flexed or the fitting is pressed, inspect this elbow and the holed plug for cracking or leakage. Small pneumatic fittings can look similar, so match the barbed size and plug connection before replacement.
A leaking air fitting can prevent a sensing edge from signaling the operator. Do not bypass the edge circuit to keep the door or gate running; repair the air system and test the safety function before use.
It connects the small air-line tubing from an Air-Wave or pneumatic switch to a holed plug in the sensing edge hose assembly.
The 218-27-18 connector is commonly used with P-50H and P-75H holed plugs when the correct hose size is present.
No. P-75 is a solid plug without the connector hole. Use the connector only with the proper holed plug style.
Miller Edge lists the 218-27-18 as a 3/32 in. x 3/32 in. barbed elbow connector.
Yes. A cracked or loose air fitting can leak pressure and keep an Air-Wave or pneumatic edge from activating reliably.
