Pick the Right Ball Nose Spring Plunger for You

The inner piece is hollow with a hole in the center, and the outer piece is solid around the hole with a smaller threaded center to accept either a rubber stopper or an airlock. In use, water is filled into the ball nose spring plunger until it reaches the top of the inner tubular chamber. Next, an appropriately-sized hole is drilled through both pieces from one side so that it lines up over this chamber when they are rotated closed by hand. A short length of plastic tubing is then pushed into this hole, which makes it possible to fill or drain air from below without disassembling the plunger.

For More Info :- https://www.techni-toolproduct....s.com/about-ball-spr

https://www.dewalist.com/servi....ces/services-others/

image