Yes they are expensive. But they work. Rubber o-rings don't seal as well as these neoprene o-rings and rubber isn't durable. Given all the pros and cons, it seems that this collection can't get any better. Good range of sizes and quantities of each selection.
Vacuum cleaner Dreame V9 Global, white
145 Review
Joywayus 5/8" ID Hose Barb Hex Union Brass Fitting Water/Fuel/Air With 10 Stainless Steel Clamps (Pack Of 5)
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High-Quality QiiMii Stainless Steel Sanitary Clamp With Silicone Gasket - 2 Inch, Single Pin Tri Clover Design
16 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