The new boxed PT2's , mini's and prolly other kangers that take the protank heads have a opaque silicone looking positive insulator and its real crap. Its the heads that are included in the box, they are so soft that its easily squished and cutting off airflow and could cause leaking. The heads in the blister 5 packs are whiteish and more rubber looking. I got both PT2's, mini's and heads from the same coop the other day and have 2 different color of insulators. Just gently pull the pin outwarda iota and pull the insulator down and reround it and you should be good until you add that extra 1/16 turn and it squishes again especially if its saturated with juice..What a Pain. I'm very unhappy with this and have to waste all the included heads to save myself the frustration.