What is this???????

[Foodaddy]

Hello all,

I seem to have lost this or it simply has broken off but I cannot for life of me find the name of what it is. In the picture, it is the black cap on top of the line, sitting in front of the belt. The picture is titled, "Ford Explorer Radiator Replacement - Page 2"

https://www.google.ae/url?sa=i&rct=...dWify2kyctV4TmUk_N3SBWPw&ust=1475821103335488

 

[swshawaii]

A/C Service Port Cap (High Side)

https://www.google.com/search?q=ac+...ved=0ahUKEwjtjtm3yMXPAhUp04MKHaQfApwQ_AUICSgC

 

[Foodaddy]

Thank you sir. You saved my bacon.