Unsure how to check for functionality other than visually looking at it. I can not see anything that leads me to believe there is anything wrong with it. If it has packings or O-Rings inside of the unit I would replace them for good measure prior to use but Again, I have no clue.
LOOK AT THE PICTURES AND ASK FOR OTHERS IF YOU NEED THEM BEFORE PURCHASING. You will be receiving the exact one pictured. Graco 241906 Husky 716 Air-Operated Diaphragm Pumps. Husky 716 Air-Operated Diaphragm Pumps, ¾ inch Positive Displacement Double Diaphragm Pump.
The Husky 716 is a ¾ inch (19.05 mm) connection is available in aluminum and stainless steel. The Husky 716 air operated diaphragm pump features an external controller for remote control capabilities. Benefits Of The Husky 716 Double Diaphragm Pumps.
No mechanical seals which causes fluid leaks or failures. Runs quietly at less than 85 dBa with easy-to-use remote muffler capability for even lower noise levels. Easy-to-service air valve and ball checks.
100 psi (7 bars, 0.7 MPa). 3/32 in (2.5 mm). 0.04 in (0,64 liter). The item "GRACO Husky 716 Metal Air-Operated Double Diaphragm Pump 16 GPM" is in sale since Thursday, February 14, 2019.This item is in the category "Business & Industrial\HVAC\HVAC Parts\Other HVAC Parts". The seller is "infantryron" and is located in Cumberland City, Tennessee. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.