It's worth mentioning that the AIR20 uses battery clamps ... hose, which will probably loosen up with time. Ours came with a 1/4-inch NPT male quick-connect fitting, valve core tool, teflon ...
Mann makes OEM-level filters and is actually the original equipment supplier for many of the big German auto brands ... the ducts will fasten with hose clamps. Loosen the hose clamps and gently ...