1/2 INLET / OUTLET DIAMETER. WE ARE ALWAYS HERE TO HELP YOU. AND WE STAND BEHIND EVERYTHING WE SELL! THANK YOU FOR HELPING US SERVE YOU BETTER! OUR HOURS OF OPERATION ARE 7AM-3PM EST. ORDERS PUT IN BEFORE 2PM EST WILL GO OUT. THAT SAME DAY, ORDERS PLACED AFTER 2PM. WILL GO OUT NEXT DAY. PLEASE LET US KNOW. WE ARE HAPPY TO HELP! PES #49 LOCATED PO BACKROOM ROW A SHELF 2 JR. This item is in the category “Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Vacuum Pumps\Diaphragm Pumps”. The seller is “breakdownsolutions” and is located in this country: US. This item can be shipped worldwide.