{"product_id":"rocket-dampfgriff-m839905537","title":"Rocket Steam Knob – M839905537","description":"\u003cdiv class=\"ccc-mobile-wrapper\"\u003e\n\u003cstyle\u003e.ccc-mobile-wrapper{max-width:880px;margin:0 auto;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;color:#1d1d1f;line-height:1.65;font-size:17px}.ccc-mobile-wrapper h2{font-size:1.7em;line-height:1.25;margin:0 0 .6em;font-weight:700}.ccc-mobile-wrapper h3{font-size:1.3em;line-height:1.3;margin:1.8em 0 .5em;font-weight:700}.ccc-mobile-wrapper h4{font-size:1.05em;margin:1.1em 0 .2em}.ccc-mobile-wrapper p{margin:0 0 1em}.ccc-mobile-wrapper a{color:#0b6b5f;text-decoration:underline}.ccc-compare-table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.97em}.ccc-compare-table th,.ccc-compare-table td{text-align:left;padding:10px 12px;border-bottom:1px solid #e3e3e6;vertical-align:top}.ccc-compare-table th{width:42%;font-weight:600;color:#3a3a3c}.ccc-roastery-tip{background:#eff6f4;border-left:4px solid #0b6b5f;border-radius:10px;padding:16px 18px;margin:1.6em 0}.ccc-return-note{background:#fdf3ef;border-left:4px solid #b4532a;border-radius:10px;padding:16px 18px;margin:1.6em 0}.ccc-faq h4{font-weight:700;margin:1.2em 0 .2em}@media(max-width:600px){.ccc-mobile-wrapper{font-size:16px}.ccc-mobile-wrapper h2{font-size:1.45em}.ccc-mobile-wrapper h3{font-size:1.18em}}\u003c\/style\u003e\n\u003ch2\u003eThe knob you have in your hand a hundred times a day\u003c\/h2\u003e\n\u003cp\u003eThe steam knob is one of the few parts of an espresso machine that is in constant contact with skin. It has to be easy to grip without slipping, it has to keep heat away, and it has to transfer torque cleanly to the valve spindle – every day, for years.\u003c\/p\u003e\n\u003cp\u003eWhat goes first is almost never the function, but the surface: the knob turns dull, develops cracks or comes loose at the mount. And then there is the second case that happens in every bar sooner or later – a jug, a tamper, a careless moment, and the knob is broken.\u003c\/p\u003e\n\u003ch3\u003eWhen it is due\u003c\/h3\u003e\n\u003cp\u003eThe knob is broken, cracked or has come loose at the mount. It spins freely on the spindle. The surface is so worn that it slips in a wet hand – with steam, that is not just unpleasant but a safety issue. Or you want to restore the look of the machine’s control area.\u003c\/p\u003e\n\u003ch3\u003eAt a glance\u003c\/h3\u003e\n\u003ctable class=\"ccc-compare-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eSteam knob, control part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInstallation location\u003c\/th\u003e\n\u003ctd\u003eOn the outside of the steam valve assembly, on the valve spindle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eRocket. The item description available to us does not say which model series the number covers – please check before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eScope of delivery\u003c\/th\u003e\n\u003ctd\u003eOne knob. Spindle, clip, cover and O-ring are separate items.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart number\u003c\/th\u003e\n\u003ctd\u003eM839905537\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVersion\u003c\/th\u003e\n\u003ctd\u003eColour, material and dimensions are not documented for this number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eRocket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWho it is for\u003c\/h3\u003e\n\u003cp\u003eFor anyone whose steam knob is broken or can no longer be gripped safely – and for businesses that want to restore the look of a machine before reselling it or after years of use. A new knob changes the impression of the entire front.\u003c\/p\u003e\n\u003ch3\u003eWhat goes with it\u003c\/h3\u003e\n\u003cp\u003eThe \u003ca href=\"\/en\/products\/rocket-clip-drehgriff-dampf-wasser-cellini-giotto\"\u003eclip for the steam and water knob\u003c\/a\u003e, the \u003ca href=\"\/en\/products\/rocket-o-ring-drehgriff-dampf-wasser-cellini-giotto\"\u003eO-ring for the knob\u003c\/a\u003e, the \u003ca href=\"\/en\/products\/rocket-achse-dampf-wasserhahn-komplett-r58-bicocca\"\u003ecomplete spindle for R58 and Bicocca\u003c\/a\u003e and the \u003ca href=\"\/en\/collections\/zubehor-und-ersatzteile-rocket\"\u003eRocket accessories and spare parts\u003c\/a\u003e category.\u003c\/p\u003e\n\u003cdiv class=\"ccc-roastery-tip\"\u003e\n\u003cp\u003e\u003cstrong\u003eFrom our workshop in Bern and Zurich\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOur routine, not a manufacturer requirement: in the evening we wipe steam knobs with a damp cloth and never with an abrasive cleaner. Milk splashes that dry on and are then rubbed off are the main reason a knob looks dull after two years. And when frothing, we hold the jug, not the knob – leaning on the knob puts a lateral force on the valve spindle that it is not designed for. Afterwards, a cappuccino as a check: \u003ca href=\"\/en\/products\/very-nutty-kraftiger-robusta-aus-indien\"\u003eVery Nutty\u003c\/a\u003e for milk, \u003ca href=\"\/en\/products\/nutty-delight-kaffee-blend-brasilien-indien\"\u003eNutty Delight\u003c\/a\u003e as an all-rounder, \u003ca href=\"\/en\/products\/cozy-chocolate-natural-brasilien-kaffeebohnen\"\u003eCozy Chocolate\u003c\/a\u003e as the sweet counter-check. More in \u003ca href=\"\/en\/collections\/kaffeebohnen\"\u003eCoffee beans\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ccc-return-note\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo returns\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOriginal spare parts are excluded from exchange and return. They are sourced specifically for each order and cannot be resold after installation or a test fitting on the machine. So before ordering, check the model, year of manufacture and serial number of your machine – or drop us a line and we will clarify the fit together. Your rights in the event of defective goods remain unaffected.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ccc-faq\"\u003e\n\u003ch4\u003e\u003cstrong\u003eDoes the knob fit my Rocket?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe part number is M839905537. The description available to us does not say which model series it covers. Send us the serial number of your machine and ideally a photo of the existing knob, and we will check before you order.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eWhat colour is the knob?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eWe have no information on this, and we do not claim anything here. If the colour matters to you, we will ask before you order.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eAre the clip or cover included?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eNo. Only the knob is supplied. Spindle, clip, cover and O-ring are separate items.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eCan I replace the knob myself?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eIt sits on the spindle from the outside and is accessible without opening the machine. Still, disconnect the machine from the power supply first and let it cool down – the valve assembly gets hot.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eCan I see the part in your showroom?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eYes. We are in Bern at Gerberngasse 44 and in Zurich at Hagenholzstrasse 50b. Bring the serial number of your machine or simply the old knob, and we will compare directly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eQuestions about the fit? Write to us at \u003ca href=\"mailto:office@coffeecoachingclub.ch\"\u003eoffice@coffeecoachingclub.ch\u003c\/a\u003e. We deliver across Switzerland and to Liechtenstein in 2-4 working days.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does the knob fit my Rocket?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The part number is M839905537. The description available to us does not say which model series it covers. Send us the serial number and ideally a photo.\"}},{\"@type\":\"Question\",\"name\":\"What colour is the knob?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"We have no information on this. If the colour matters to you, we will ask before you order.\"}},{\"@type\":\"Question\",\"name\":\"Are the clip or cover included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Only the knob is supplied. Spindle, clip, cover and O-ring are separate items.\"}},{\"@type\":\"Question\",\"name\":\"Can I replace the knob myself?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It sits on the spindle from the outside. Disconnect the machine from the power supply first and let it cool down – the valve assembly gets hot.\"}},{\"@type\":\"Question\",\"name\":\"Can I see the part in your showroom?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. We are in Bern at Gerberngasse 44 and in Zurich at Hagenholzstrasse 50b.\"}}]}\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Rocket","offers":[{"title":"Default Title","offer_id":56309508964737,"sku":"A04303","price":27.94,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/2265\/2931\/files\/A04303_1.jpg?v=1790119187","url":"https:\/\/coffeecoachingclub.ch\/en\/products\/rocket-dampfgriff-m839905537","provider":"Coffee Coaching Club GmbH","version":"1.0","type":"link"}