Tennant/Nobles - 4039812 - Knob, Star, 2.00Od 4Ear M8X1.25 [Yel] (Replaces Tennant 1213677)

Tennant 4039812 is a yellow star knob with four ears, 2.00 in (50.8 mm) across and threaded M8 x 1.25 (page name: Knob, Star, 2.00Od 4Ear M8X1.25 [Yel]). It is also listed as 1213677.

It belongs to the squeegee on the T300, T500 and related Nobles Speed Scrub models. On the T300, Tennant lists it in squeegee kit 4026477, 4 per squeegee, and the same kit shows up for the T260 and A300. In Tennant's T300 manual you change blades by fully loosening the two outside knobs, which frees the spring-loaded blade retainer from the squeegee frame; squeezing the retainer and frame together loosens the knobs faster.