When my original back box gave up the ghost at about 100k, I went to a local professional who fitted a Walker (although I have only just this minute tracked down the manufacturer as the fitter only gave a reference number in his invoice). I was a bit worried that it wouldn't perform as well as the double-skinned box it replaced but it has been excellent and very quiet. I paid just over 100 Euro which I thought was reasonable and I am even more pleased now that I find it is a recommended replacement.Jeremy
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