I purchased this filter for my MG Midget but it was apparantly the wrong one (years ago) so I decided to crack'er open. Very well made filter IMHO...to bad it didnt fit. Spring loaded anti-drainback valve! Coil spring to hold filter in place, coil spring relief valve. Now on another note, I did get the correct Crossland filter and opened it to my dismay....FRAM
. No more Crossland for the Midget haha.