The Briggs B500028 Chrome Push Button comes complete. The button is plastic. Therefore it will not rust. Also the nut for this button is plastic. However the button being plastic will prevent rust. Therefore it will last longer. This button comes in a chrome finish. It also work on many different Briggs tanks. The Button being chrome will match any toilet. Also this is a genuine Briggs replacement part. 

The button comes complete with the nut. Therefore it can be secured to the tank. The nut that comes with this valve is plastic. However it will not rust. This button is also a genuine Briggs replacement part. Therefore it will replace the old button in the 4420, 4421, and 4450 tanks. This Button only comes with one button on top. Where some push buttons have two. 

In conclusion this button comes complete. The Briggs B500028 Chrome Push Button has the nut to secure it to the tank. However it is made of plastic. Therefore it will not rust. Also the arm and button itself are plastic. However they are genuine replacement parts. We only offer genuine Briggs replacement parts. 

• Genuine Briggs replacement parts
• Plastic button
• Plastic nut
• Plastic arm
• Fits tanks 4420, 4421, and 4450