Seiko Seiki STP-1301L1B SCU-H1301L1B STP Turbomolecular Pump Control Unit. STP Turbomolecular Pump Control Unit. Track Page Views With. Auctiva’s FREE Counter. This item is in the category “Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Vacuum Pumps\Other Vacuum Pumps”. The seller is “dr.dantom” and is located in this country: IL. This item can be shipped worldwide.