I fill my other 112 from a refillable 88g bottle but the filler was made from scratch as when I got the gun it wasn't there so we did a a bit of general license and made it so it sealed with an o ring like modern fillers and was 1/8"bsp rather than 1/8"nps
this one I found a fill fitting that came with a filter body for my air compressor screw straight in
the 111 is the .177 version of the 112 and it's the 115 and 116 that are the shorter ones