im a rookie ....bought some prolong for the erratic sometimes hard shifting tranny...the orange plastic filler tube cap doesnt screw on or compression fit ...dont want to bust it by forcing ....any one ?????

thanks..

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82' 300 sd 100k
98' sierra 3500 6.5 TD 200 k(for sale)
2001' VW tdi 60 k mrs. car ...nice
2000' pro stock RWD honda (tagracecraft.ca)
44' foot feather lite hauler
and Al the idiot...cant pack a chute worth poo