Hi guys...I have a gurgling sink problem,when we empty the sink in the kitchen the sink in the utility room gurgles basically every time,it is just the utility room sink no other noises from other sinks or when toilets flush etc etc just the one sink,we have recently had a dishwasher installed next to the sink and since then the gurgling noise seems to have started ( I cannot remember it happening before that but I may be wrong) I have checked for blockages in sink pipe work & outside venting pipe on the roof and no blockages found,I have now discovered that the sink pipe work may need a vent of its own as the gurgling could be caused by some kind of air siphoning,I am willing to try this but where would I put the actual vent fitting ?...I am enclosing a pic of pipe work under the sink so could someone please advise as to where to fit the vent fitting? As I do not want to try to fit it to high or to low, many many thanks in advance. //www.diynot.com/network/worcesterman47/albums/