The Varex OPTI X-Ray tube can be used with the Siemens Multix system and the compatible models listed below. Complete the form below to order this part. Looking for a part for a different machine? Our inventory contains over 40,000 quality tested, refurbished, repainted, and retested parts. Call our Parts Team to learn about parts that haven’t made it to our website yet. We’re on standby to help resolve whatever parts related Siemens medical imaging equipment issues or questions you might have.