They are well made and very reasonably priced, but are so small that they are very difficult to grab hold of to screw/unscrew them effectively. I have only found two other adapters of this type, one made of metal and the other made of red plastic. The red one has rectangular pads that offer good grip, but they're expensive!
1 Inch Beduan Brass Electric Solenoid Valve, 12V Normally Closed Air Valve For Water, Gas, Fuel, And Oil
10 Review
6 Pack Miahart Adjustable 304 Stainless Steel 4 Inch Hose Clamp Duct 91Mm-114Mm Worm Gear Pipe Clamp For Automotive, Mechanical Agriculture.
18 Review
12V Brass Solenoid Valve, 3/4" Electric Air Valve For Water, Air, Gas, Fuel And Oil - Normally Closed By Beduan
10 Review
Vacuum cleaner Dreame V9 Global, white
145 Review