Jacketed glass immersion well for use with our 7825 series lamps within our 6962,7863,7864,7865 & 7891 series reactors. Codes -30 & -40 feature a small diameter glass inner feed tube to ensure the flow of coolant from the bottom of the well up to the outlet. Codes -35 & -45 feature a PTFE inner feed tube to accomplish the same task and is secured with a #7 Ace-Thred and bushing. Well is secured within the reactor with a non-freezing #50 Ace-Thred and can be adjusted to the desired height.