Bolted construction for superior containment. Longest Mean Time Between Repair (MTBR). 8 lbs (3.6 kg).See pictures for more details. We can only describe what we know and what we see. THANK YOU FOR YOUR CONSIDERATION. PLEASE SEE PICTURES AS THEY ARE PART OF THE DESCRIPTION. This item is in the category "Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Vacuum Pumps\Diaphragm Pumps". The seller is "fairbargainz" and is located in this country: US. This item can be shipped worldwide.