: These parts are often part of a larger "Dolly Kit" (such as Kit 22) used for maintaining pump head rings or plunger seals. 2. Heavy Transport & Trailer Equipment

: For military or heavy-duty vintage dollies, the Dolly Set Maintenance Manual provides detailed PDF instructions on air reservoir draincocks, brake shoe handling (warning of asbestos in older models), and hub rotation.

: Found in the Idrobase - EnviroSpec Full Line Catalog , this refers to specific O-rings used in seal kits for professional pump systems like Kärcher or Interpump.

In the 1980s and early trailers, "dolly" refers to the unpowered vehicle used to support a semi-trailer.

: Modern versions like the TAD 22 are designed for two-axle semi-trailers, but they follow the mechanical principles established by older 1980s-era transport dollies. 3. Film & Production Equipment