Used shutoff valve for the headlight vacuum system of all 1969-70 Mercury Cougars. Also found on 1969-70 Ford and Mercury full sized cars with hidden headlights. Additionally these were also used on 1969-70 midsized Ford and Mercury such as Torino, Cyclone, also with hide away headlamps. This is a black plastic shutoff switch or connector, 1969 cars used a white valve that crumbled from the under hood heat. Note that the indicator tabs perpendicular to the lines means 'open'. Turning the valve in-line with the vacuum hoses turns it off.
Replaces Ford part number D0AZ-13A169-A.
*Installation Tip - This valve is indexed, it has HL and C noted on the bottom. HL is towards the headlights. The tips are also color coded as shown in the picture and those colors indicate which hose with the colored stripe goes on each line.