Can I buy a spare metal vessel support collar for my Reactor-Ready or Reactor-Ready Pilot? A vessel support collar is required to mount a vessel within the Reactor-Ready or Reactor-Ready Pilot frame. Two vessel collars are supplied with each RR121300 Reactor-Ready Duo Core; one vessel collar is included in RR121000 Reactor-Ready Pro, RR121001 Reactor-Ready Starter and RR210000 Reactor-Ready Pilot Core. You may wish to purchase additional metal support collars, particularly if you have lots of vessels (so you can keep one correctly positioned on each vessel). For Reactor-Ready Flex and Reactor-Ready Duo, the part number is: RR121048: Vessel Support Collar For Reactor-Ready Pilot, the part number is: RR210018: Pilot Vessel Support Collar