Diameter: 1.57 (4.0 cm). This unit will arrive in the condition shown. It comes with a 14 Day Guarantee against being DOA from receipt.Power cords and power adapters are never included unless specifically mentioned. For questions regarding this item, please reference the SKU to help us better serve you. ATTENTION: WE HAVE BEEN IN BUSINESS SINCE 1978. This item is guaranteed to be as described. We reserve the right to refuse service to anyone that does not comply with the terms listed and linked here. The sole and exclusive venue for any lawsuit arising out of or relating to this agreement shall be in Las Vegas, Nevada. This item is in the category "Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Vacuum Pumps\Other Vacuum Pumps". The seller is "ecrunch" and is located in this country: US. This item can be shipped worldwide.