SAMICK PRECISION
SAMICK PRECISION LMF20UU 20mm Flanged Linear Bushing Set of 10 pcs
You will find that Red Rubber Grease resists breakdown from water spraying.
SAMICK PRECISION LMF25UU 25mm Flanged Linear Bushing Set of 10 pcs
What I like about the HBN 0.5microns unit is its straightforward installation process.