If its a flat face to flat face fitting you really want a washer in it to do the task of stopping it leaking compared to taping the threads as it a better method.
It currently has a washer but still leaks, I’m assuming due to cheap plastic bits.
I prefer fibre washers to rubber as you can at least compress them against the face.
@chrisbmx116 started
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If its a flat face to flat face fitting you really want a washer in it to do the task of stopping it leaking compared to taping the threads as it a better method.