... /S JIEBA Series handy vacuum cleaner:1. round stainless steel tank for BF501, solid and durable, not easy to be rusty ... . semitransparent plastic tank for BF509A,acidproof and anti-alkalis, and collision resistance2. silent ... machine, also waterproof and static resistance.4. the large capacity tank with the flexible axle, equipped with a watershoot.5. equipped ...