{"product_id":"tag-closed-end-28-18mm-double-ufo-downstem","title":"TAG -  Closed End 28\/18MM Double UFO Downstem","description":"\u003ch2 data-start=\"297\" data-end=\"350\"\u003e\u003cstrong data-start=\"300\" data-end=\"348\"\u003eTAG – 28\/18MM Super Slit Double UFO Downstem\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3 data-start=\"351\" data-end=\"406\"\u003e\u003cstrong data-start=\"355\" data-end=\"406\"\u003eDual Diffusion. Smooth Pull. Advanced Function.\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"408\" data-end=\"823\"\u003eThe \u003cstrong data-start=\"412\" data-end=\"458\"\u003eTAG 28\/18MM Super Slit Double UFO Downstem\u003c\/strong\u003e is built for performance and airflow.\u003cbr data-start=\"496\" data-end=\"499\"\u003eFeaturing two stacked UFO-style diffusers, each lined with multiple super slit openings, this system provides heavy, even diffusion without restricting draw speed. The 28MM male outer joint fits large-joint beakers and straight tubes, while the 18MM female inner joint maintains compatibility with standard 18MM male slides.\u003c\/p\u003e\n\u003chr data-start=\"825\" data-end=\"828\"\u003e\n\u003ch3 data-start=\"830\" data-end=\"852\"\u003e\u003cstrong data-start=\"834\" data-end=\"850\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"853\" data-end=\"1459\"\u003e\n\u003cli data-start=\"853\" data-end=\"973\"\u003e\n\u003cp data-start=\"855\" data-end=\"973\"\u003e🛸 \u003cstrong data-start=\"858\" data-end=\"889\"\u003eDual UFO Diffusion Chambers\u003c\/strong\u003e – Two stacked UFO percs deliver layered bubble action for smoother, cooler draws.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"974\" data-end=\"1101\"\u003e\n\u003cp data-start=\"976\" data-end=\"1101\"\u003e💨 \u003cstrong data-start=\"979\" data-end=\"1000\"\u003eSuper Slit Design\u003c\/strong\u003e – Each diffuser features high-density slits for maximum surface agitation and balanced resistance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1102\" data-end=\"1260\"\u003e\n\u003cp data-start=\"1104\" data-end=\"1260\"\u003e⚙️ \u003cstrong data-start=\"1107\" data-end=\"1138\"\u003e28\/18MM Joint Configuration\u003c\/strong\u003e – Large outer joint (28MM male) connects to 28MM beakers; inner joint (18MM female) accepts 18MM slides or accessories.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1261\" data-end=\"1368\"\u003e\n\u003cp data-start=\"1263\" data-end=\"1368\"\u003e🧱 \u003cstrong data-start=\"1266\" data-end=\"1301\"\u003eThick Borosilicate Construction\u003c\/strong\u003e – Durable, precision-ground joints ensure a snug, airtight seal.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1369\" data-end=\"1459\"\u003e\n\u003cp data-start=\"1371\" data-end=\"1459\"\u003e🧼 \u003cstrong data-start=\"1374\" data-end=\"1394\"\u003eOpen Flow Design\u003c\/strong\u003e – Clears easily with minimal splash and smooth drag reduction.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1461\" data-end=\"1464\"\u003e\n\u003ch3 data-start=\"1466\" data-end=\"1501\"\u003e\u003cstrong data-start=\"1470\" data-end=\"1499\"\u003eDownstem Measurement Note\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1502\" data-end=\"1758\"\u003eDownstem length is measured by insert length (from the end of the frosted joint to the tip).\u003cbr data-start=\"1594\" data-end=\"1597\"\u003eAlways confirm your existing fitment before purchase.\u003cbr data-start=\"1650\" data-end=\"1653\"\u003e👉 \u003ca data-start=\"1656\" data-end=\"1758\" class=\"decorated-link\" rel=\"noopener\" href=\"https:\/\/www.thickassglass.com\/pages\/downstem-size-guide\"\u003e\u003cstrong data-start=\"1657\" data-end=\"1700\"\u003eTAG Downstem Sizing \u0026amp; Measurement Guide\u003c\/strong\u003e\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 20 20\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cpath d=\"M14.3349 13.3301V6.60645L5.47065 15.4707C5.21095 15.7304 4.78895 15.7304 4.52925 15.4707C4.26955 15.211 4.26955 14.789 4.52925 14.5293L13.3935 5.66504H6.66011C6.29284 5.66504 5.99507 5.36727 5.99507 5C5.99507 4.63273 6.29284 4.33496 6.66011 4.33496H14.9999L15.1337 4.34863C15.4369 4.41057 15.665 4.67857 15.665 5V13.3301C15.6649 13.6973 15.3672 13.9951 14.9999 13.9951C14.6327 13.9951 14.335 13.6973 14.3349 13.3301Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003chr data-start=\"1760\" data-end=\"1763\"\u003e\n\u003ch3 data-start=\"1765\" data-end=\"1793\"\u003e\u003cstrong data-start=\"1769\" data-end=\"1791\"\u003eWhy You’ll Love It\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1794\" data-end=\"2082\"\u003eThis downstem is designed for \u003cstrong data-start=\"1824\" data-end=\"1865\"\u003emaximum diffusion and airflow balance\u003c\/strong\u003e, combining the elegance of the UFO form with the high-density function of TAG’s Super Slit system. It creates a powerful chug that stays smooth and consistent, perfect for those upgrading from a single-diffuser stem.\u003c\/p\u003e\n\u003chr data-start=\"2084\" data-end=\"2087\"\u003e\n\u003ch3 data-start=\"2089\" data-end=\"2118\"\u003e\u003cstrong data-start=\"2093\" data-end=\"2116\"\u003eMade To Order (MTO)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2119\" data-end=\"2330\"\u003eNeed a specific joint, length, or variant? TAG’s \u003cstrong data-start=\"2168\" data-end=\"2185\"\u003eMade To Order\u003c\/strong\u003e program can produce nearly any configuration.\u003cbr data-start=\"2231\" data-end=\"2234\"\u003e👉 \u003ca data-start=\"2237\" data-end=\"2330\" class=\"decorated-link\" rel=\"noopener\" href=\"https:\/\/www.thickassglass.com\/pages\/made-to-order-mto\"\u003e\u003cstrong data-start=\"2238\" data-end=\"2274\"\u003eLearn More – Made To Order (MTO)\u003c\/strong\u003e\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 20 20\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cpath d=\"M14.3349 13.3301V6.60645L5.47065 15.4707C5.21095 15.7304 4.78895 15.7304 4.52925 15.4707C4.26955 15.211 4.26955 14.789 4.52925 14.5293L13.3935 5.66504H6.66011C6.29284 5.66504 5.99507 5.36727 5.99507 5C5.99507 4.63273 6.29284 4.33496 6.66011 4.33496H14.9999L15.1337 4.34863C15.4369 4.41057 15.665 4.67857 15.665 5V13.3301C15.6649 13.6973 15.3672 13.9951 14.9999 13.9951C14.6327 13.9951 14.335 13.6973 14.3349 13.3301Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003chr data-start=\"2332\" data-end=\"2335\"\u003e\n\u003ch3 data-start=\"2337\" data-end=\"2371\"\u003eFree 2-Year Limited Warranty\u003c\/h3\u003e\n\u003cp data-start=\"2372\" data-end=\"2560\"\u003eQualifying 1st Quality TAG glass purchased from thickassglass.com or shop.thickassglass.com on or after October 15, 2026 includes a Free 2-Year Limited Warranty. One eligible replacement within two years after delivery is 65% off MSRP (you pay 35% of MSRP), plus shipping \u0026amp; handling. Quartz, lower-grade items and other brands are excluded. \u003ca href=\"\/pages\/warranty-protection-plan\"\u003eFull warranty terms and earlier paid-plan coverage\u003c\/a\u003e.\u003c\/p\u003e","brand":"Thick Ass Glass","offers":[{"title":"(Pre-Order) (4.50\") Laser Engraved Logo - Clear .02","offer_id":68400315007200,"sku":"M28.F18-DS-828T-8825C-LE.02.3","price":39.99,"currency_code":"USD","in_stock":true},{"title":"(5.50\") No Logo - Clear .02","offer_id":68400315039968,"sku":"DS-828-0200C.02","price":44.99,"currency_code":"USD","in_stock":false},{"title":"(5.00\") Laser Engraved Logo - Clear .02","offer_id":68400315072736,"sku":"M28.F18-DS-828T-0199C-LE.02.3","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(6.50\") No Logo - Clear .02","offer_id":68400315105504,"sku":"M28.F18-DS-828-4891C.02.1","price":44.99,"currency_code":"USD","in_stock":false},{"title":"(7.00\") Laser Engraved Logo - Clear .02","offer_id":68400315138272,"sku":"DS-828T-0870C-LE.02.1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(4.00\") Laser Engraved Logo - Clear .02","offer_id":68400315171040,"sku":"M28.F18-DS-828T-0865C-LE.02.2","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(3.75\") Laser Engraved Logo - Clear .02","offer_id":68400315203808,"sku":"M28.F18-DS-828T-8388C-LE.02.2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"(6.75\") Laser Engraved Logo - Clear .02","offer_id":68400315236576,"sku":"DS-828T-2694C-LE.02.1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(6.00\") Laser Engraved Logo - Clear .02 (Open End)","offer_id":68400315269344,"sku":"M28.F18-DS-828T-3359C-LE.03.1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(7.00\") Laser Engraved Logo - Clear .02 (2nd Quality)","offer_id":68400315302112,"sku":"DS-828T-0870C-LE.02.1 (2nd Quality)","price":26.0,"currency_code":"USD","in_stock":true},{"title":"(7.25\") Laser Engraved Logo - Clear .02","offer_id":68400315334880,"sku":"DS-828T-3558C-LE.02.1","price":44.99,"currency_code":"USD","in_stock":false},{"title":"(4.75\") Laser Engraved Logo - Clear .02","offer_id":68400315367648,"sku":"M28.F18-DS-828T-1454C-LE.02.3","price":39.99,"currency_code":"USD","in_stock":true},{"title":"(4.25\") Laser Engraved Logo - Clear .02","offer_id":68400315400416,"sku":"DS-828T-8828C-LE.02.1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(Pre-Order) (3.50\") Laser Engraved Logo - Clear .02","offer_id":68400315433184,"sku":"M28.F18-DS-828T-4347C-LE.02.1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(5.50\") Laser Engraved Logo - Clear .02","offer_id":68400315465952,"sku":"M28.F18-DS-828T-3960C-LE.02.2","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(4.00\") Laser Engraved Logo - Full Purple .02","offer_id":68400315498720,"sku":"M28.F18-DS-828T-4334FPu-LE.02.1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"(MTO) (5.00\") Laser Engraved Logo - Green .02","offer_id":68400315531488,"sku":"M28.F18-DS-828T-4384G-LE.02.1","price":69.99,"currency_code":"USD","in_stock":true},{"title":"(5.25\") Laser Engraved Logo - Clear .02","offer_id":68400315564256,"sku":"M28.F18-DS-828T-3959C-LE.02.1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(4.00\") Laser Engraved Logo - Full Purple .02 (2nd Quality)","offer_id":68400315597024,"sku":"M28.F18-DS-828T-4334FPu-LE.02.1 (2nd Quality)","price":49.0,"currency_code":"USD","in_stock":true},{"title":"(5.75\"\") Laser Engraved Logo - Clear .02 (Open End)","offer_id":68400315629792,"sku":"M28.F18-DS-828T-4846C-LE.03.1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"(MTO) (4.50\") Laser Engraved Logo - Yellow\/Red\/Green .02","offer_id":68400315662560,"sku":"M28.F18-DS-828T-4761YRG-LE.02.2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"(7.00\") No Logo - Clear .02","offer_id":68400315695328,"sku":"M28.F18-DS-828-4893C.02.1","price":44.99,"currency_code":"USD","in_stock":false},{"title":"(MTO) (4.50\") Laser Engraved Logo - Full Black\/Red .03 (Open End)","offer_id":68400315728096,"sku":"M28.F18-DS-828T-5199FBlR-LE.03.1","price":69.99,"currency_code":"USD","in_stock":true},{"title":"(3.50\") Laser Engraved Logo - 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