Review on 🚽 Master Plunger MP500: The Ultimate Heavy Duty All Purpose Plunger for Commercial & Residential Use – Ideal for Laundry Tubs, Bath Tubs, Kitchen Sinks, Garbage Disposal, and Toilets. With Air Release Valve and Powerful Plumbing Performance by Gary Duncan

Generates a lot of pressure with little force. The knob turns to allow air to escape when you squeeze the plunger and then turn the 2 closed B4s, retract, refill Water separation - I use water instead of air to create a reliable initial clean - I've had the same B4 which has lasted for years / once you get the hang of it - you'll never use another one - no splatters and best of all - MADE IN USA! - sale ! highly recommended, well built / durable / good value / color choice