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Dad the grey pipe on the left is linked to the washing machine, it got loose and leaked. How do I stop it happening again?
(reddthat.com)
You should be able to undo it and make sure nothing is cracked or broken first. Then you can add teflon tape to the exposed threads. Two to three wraps in clockwise direction. Then reassemble making sure the connection isn’t too tight. Hand tight plus maybe a quarter turn should be good. Check in a couple days or so and make sure it isn’t leaking and still tight and you should be good!