Sealing ring, Copper, 25.75 x 21.2 x 1.4 mm, Becker, U Series, Part# 300089

This copper ring is made for the larger Becker U Series pumps. It fits these models :

• Becker U4.400

• Becker U4.400D

• Becker U4.630

• Becker U4.630Dthis copper ring sits between threaded connections. Think of it as a crush washer. Every time you screw two metal parts together, this ring goes in between. When you tighten it, the copper compresses and stops any air or oil from leaking past.The Major Overhaul Kit for the U4.400D includes three of these copper sealing rings . That tells you that this pump uses this ring in several places. Check your pump to see how many you need before ordering.