5th Wheel Lube Plate - CURT brand
CURT brand - 10" diameter x 3/16 thick. Disc from USA for hitch on a 5th wheeler eliminates the need for lots of grease. Still apply grease to the actual kingpin to minimise wear. This disc will fit all standard pin/hitch combinations. I have used these types of discs for 8 years and been very happy with them. $5 Postage within Australia.