Vapor line coupler

A coupler comprising:

• a body defining a fluid path through which vapor is configured to flow;
• a valve positioned in the fluid path, wherein the valve is configured to be biased to a closed position and configured to be moved to an open position when the coupler is coupled to an adapter;
• and
• an arm coupled to the body and positioned externally of the fluid path, wherein the arm includes a first arm portion and a second arm portion, wherein the arm is in, or is configured to be moved to, an energized position wherein the first and second arm portions are both biased radially inwardly to couple to the coupler to the adapter.

A method for attaching a coupler comprising:

• accessing a storage tank having a vapor space and an adapter in fluid communication with the vapor space, the adapter having a groove;
• accessing a coupler including a body defining a fluid path through which vapor is configured to flow, the coupler further including a valve and an arm coupled to the body, wherein the arm includes a first arm portion located on a first side of the body and a second arm portion located on a second, opposite side of the body, wherein the first and second arm portions are both biased radially inwardly;
• and
• moving the coupler in the axial direction toward the adapter such that the coupler receives the adapter therein at a sufficient depth to open the valve and enable the first and second arm portions to each move radially inwardly into the groove to thereby couple the coupler and the adapter.