Dont remember 100% but I think that T connector is also one-way valve, if its the same as on my pre-FL (and mine just cracked) I would suggest getting it from Volvo. It wil prevent fluid from returning back to the bottle.
headlight washers - not sure if those work always or every X times and maybe only with car driving? someone else can confirm. Check if its possible to lift them manually, I *THINK* its the water pressure that lifts them up so those should move freely but again - its only my assumption, wait for confirmation.
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