久久久久久久久久久久久大色天下-天堂网2020-国产偷窥老熟盗摄视频-国产精品自产拍在线观看-七七婷婷婷婷精品国产-亚洲视频在线观看网站-刺激性视频黄页-狠狠色噜噜狠狠狠-欧美激情h-国产五月-国内熟妇人妻色在线视频-国产成人久久精品av-日韩一区二区三区免费高清

FEATURE

• DC frequency conversion technology, high efficiency and energy saving.

• Pin wheel impeller makes more bubbles.

• Venturi tube with big air flow.

• Ceramic shaft and bushings, corrosion resistance, long life.

• Sealed by expoxy resin, safe and reliable.