{"product_id":"saekodive-tank-rattle-65","title":"Saekodive Tank Rattle - 6.5\" Stainless, Magnet","description":"\u003cp\u003eA 6.5-inch stainless steel tank rattle with a built-in magnet. Shake it to get your buddy's attention underwater — the sound cuts through better than banging your tank — and the magnet holds it quiet against your cylinder until you actually need it.\u003c\/p\u003e\u003ch3\u003eWhy this one\u003c\/h3\u003e\u003cp\u003eIt is a dependable, no-maintenance signalling tool: no batteries, nothing to break. The magnet stops it rattling as you swim, so you are not making noise until you choose to.\u003c\/p\u003e\u003ch3\u003eSpecs at a glance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eLength: 6.5 inches\u003c\/li\u003e\n\u003cli\u003eMaterial: stainless steel\u003c\/li\u003e\n\u003cli\u003eSignal: audible rattle (underwater)\u003c\/li\u003e\n\u003cli\u003eMagnet: holds it silent until used\u003c\/li\u003e\n\u003cli\u003eMaintenance: none — rinse after saltwater\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTank rattle vs other ways to get attention underwater\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMethod\u003c\/th\u003e\n\u003cth\u003eWhere it works\u003c\/th\u003e\n\u003cth\u003eHands-free\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank rattle\u003c\/td\u003e\n\u003ctd\u003eUnderwater\u003c\/td\u003e\n\u003ctd\u003eClips on, magnet keeps it quiet\u003c\/td\u003e\n\u003ctd\u003eCuts through better than banging your tank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBanging your tank\u003c\/td\u003e\n\u003ctd\u003eUnderwater\u003c\/td\u003e\n\u003ctd\u003eNo — need a hard object\u003c\/td\u003e\n\u003ctd\u003eInconsistent, easy to miss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface whistle\u003c\/td\u003e\n\u003ctd\u003eSurface only\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003eFor boat pickup, not underwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow does it stay quiet when I don't need it?\u003c\/strong\u003e\u003cbr\u003eThe magnet holds the rattle against your tank so it won't sound as you move. Break it loose and shake to signal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it better than banging my tank?\u003c\/strong\u003e\u003cbr\u003eIt is more consistent and carries better underwater than tapping metal on metal, and it frees you from needing a hard object to hand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work at the surface?\u003c\/strong\u003e\u003cbr\u003eIt is for underwater attention. For surface signalling to a boat, use a whistle or an SMB instead.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eLast updated: November 2026.\u003c\/em\u003e\u003c\/p\u003e","brand":"Saekodive","offers":[{"title":"Default Title","offer_id":58164270072148,"sku":"WHOLE-SKD-006","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1044\/3338\/5812\/files\/tank-rattle-1.webp?v=1793893474","url":"https:\/\/www.sigonnadive.com\/products\/saekodive-tank-rattle-65","provider":"SigonnaDive","version":"1.0","type":"link"}