sandalwood Posted December 10, 2018 Share Posted December 10, 2018 Has the pull down sink a ubend in it. ? Trying to get all water out so will not freeze. Any help appreciated. Ian Link to comment Share on other sites More sharing options...
Derek Uzzell Posted December 10, 2018 Share Posted December 10, 2018 I don’t know how you expect anyone to give you a definitive answer to that question unless you provide the make, model and build-year of your motorhome. :-( (I refer you to the last posting of the "ALL FORUM MEMBERS - PLEASE READ” thread at the top of the Motorhome Matters forum’s first page.) As a generalisation, if the pipework through which a ‘pull down’ sink drains is not easily accessible then it’s quite likely that no U-bend will have been fitted. (If the pipework is accessible it should be obvious whether or not it has a U-bend in it.) However, even if no U-bend is fitted, that certainly does not mean that the pipework won’t have a bend or angle in it somewhere that will hold waste-water. The January 2018 issue of MMM Magazine has a ‘Top Tip’ on Page 131 about protecting motorhome waste-water drainage pipework from frost-damage, so I wonder if reading that article is what caused you to ask about the U-bend. What the article suggests is that a piece of ordinary hollow foam pipe-insulation (photo attached) of a suitable diameter be shoved tightly into the outlet plug-hole of a sink, wash-basin or shower-tray and sealed to the outlet with duct-tape. The pipe-insulation is then blown through (using one’s lungs) to expel any water that’s in the drainage pipework and drive the water on into the waste-water tank. This ploy should work whether the drainage pipework includes a U-bend or not, but it won’t be practicable if the plug-hole outlet’s waste-trap has two connectors (2nd attached photo) and one of these has been used to ‘vent’ the outlet to improve its drainage. Not sure how common ‘vented’ waste-traps are, but Rapido has fitted them on some motorhomes in the past. Link to comment Share on other sites More sharing options...
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