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Hi I'm Kevin is this the cap on the top of tank ?
The plastic ring round the top needs to be undone it's like a big nut . Once off its recommended to change this and the seal
There are tools for this but I tend to use a blunt screw driver or reachet extension bar and tap it round with a rubber mallet
No lock the arenormally tight as long as your hitting ring not tank youll be fine your meant to replace this once its heen removed anyway
How did you get on ?
Any luck ?
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