Truck
Zephyr Truck Brushes have a plastic "Bumper" around the block to protect washing surfaces. Built with a single threaded hole, available in these fibers:

Grey Flag - Flagged plastic for fine dusting. Excellent water holding capacity, "flicking action" and heat resistant.

Nylex - Nylon fiber is super light, resilient and durable. Can be boiled and is impervious to solvents, alkalis and certain acids. Do not use with mineral acid. Better water holding than other
synthetics.