Doing this for reference, and more than likely posting in the wrong sub forum. I bought a few o-rings for my 111B, and the o-ring size is 9/16 x 3/8 x 3/32, aka a #8 o-ring. Installed one, and it fits nice and tight. Perhaps be useful for someone using the search. Here's a photo:
I found a great US domestic supplier of Viton o-rings, 3/8 ID x 9/16 OD x 3/32, for 111B pump handles: Clearwater Hydraulics LLC Lewiston, ID 2-110/V7 [2-110/V7] - $0.29 : Clearwater Hydraulics LLC Clearwater is a US company in Lewiston, ID. It's part #2-110/V7. They sell them for 29 cents per o-ring. I ordered 10 for $2.90. They charged $4.64 US Postage to ship to me in Oregon. They sell them on Amazon for $3.96 for a 10-pack and $5.99 US postage. It's a bit more on Amazon I assume to cover the cut Amazon takes on each sale. I ordered direct form Clearwater and save a couple of dollars.
FYI: Fittlebox site host, sells compete service 7 piece kit for 111 & 22 stoves. HF sells this O-ring kit too.
