Can I buy a replacement PTFE stirrer guide for my jacketed lab reactor? Yes, you can purchase stirrer guides (as pictured below). For Reactor-Ready, Reactor-Ready Duo and the current Lara (Lara Plus), the part number is: RR121060: Stirrer Guide Assembly B24 10 mm For the larger Reactor-Ready Pilot, it is: RR121132: Stirrer Guide Assembly B34 16 mm For Lara Classic (serial number CLR-1001 to CLR-1060), the PTFE stirrer guide (the replacement to the old metal/glass stirrer guide) is: LR171150: Lara Classic Stirrer Guide (s/n CLR1001-60) For other types of jacketed lab reactors (traditional or custom), please contact us to discuss. Spare parts for these stirrer guides are also available. You can refer to the separate FAQ entry, ‘What spare parts are available for my Reactor-Ready or Reactor-Ready Pilot stirrer guide?’