Todays Project - What did you do today?

[f350ca]

My hot water heating system leaks a little somewhere, needs pressured up every couple of years. I put together an electric motor driven gear pump to fill the system with prestone years ago. Works but pumps way too fast to just bump up the pressure.
Built this little hand pump from scrap. 3/4 brass pipe nipple reamed out to 7/8 for the cylinder and a stainless piston. Mystery aluminum (hardest aluminium I've ever seen came from a plant that makes helicopter parts) for the body and a couple of check valves that were in stock. About a 2 inch stroke.
Worked like a charm, will be handy for pumping gear oil into diff's or transmissions, anywhere you can't easily pour.