I have a NAC9 (395-530) on my 105. It seems to not skim all the time, like there is not enough stuff to pull out for the big neck. It's on/off whenever it feels like it. Pulls out everything though. FWIW, the Bubble Magus skimmers are from China too, great products. The SCA skimmers on ebay are also Chinese, but they work great and are a lot easier on the wallet.