The lengths, as measured from the base of the flange to the end of the threaded female end, are
More Information...The lengths, as measured from the base of the flange to the end of the threaded female end, are:
Picture from Left to Right
1.5 inches - Original Secure Cover - Pictured on Left
2.0 inches - Pictured in Middle
2.77 inches. - Pictured on Right
The engagement length for the pin is 0.25 to 0.5 inches. This means that the measurement from the top of the slab to the top of the threaded barrel of the Vapor Pin(r) for each cover can be:
1.0 to 1.25 inches
1.5 to 1.75 inches
2.27 to 2.52 inches, respectively