[YOUR WALL FITTING IS DAMP AND WATER IS SEEKING INTO THE WALLPAPER?] Check your siphon rubber. It leaks faster in sink and washbasin pipes, because hot water and chemicals attack the material [SINK TRAP GASKET FOR CONNECTION TO A DRAIN PIPE] Rubber siphon fitting has a 45 mm stopper, is 25 mm deep and is suitable for drain pipes with 40 mm internal diameter [RUBBER SLEEVES FOR PIPE TO ASSEMBLE] The siphon tube rosette measures 28 - 32 mm inside - the tube siphon can have a maximum thickness of 32 mm outside [HIGH QUALITY RUBBER FITTING GASKET WITH THREE GROOVES INSIDE & SEVEN OUTSIDE] Rubber drain seal reliably connects siphon and HT pipe connection [PACKAGE CONTENTS] 2 x rubber hose cuff drain HT DN 50 with 40 mm inside and siphon 1 1/4" outside with 28 - 30 mm