I’m relatively new at this keg thing, but didn’t see anything similar on this forum. Apologies if this is common knowledge.
I blatantly stole these instructions to build my own little hand pump to clean and sanitize my beer lines:
A plastic garden sprayer, a brass fitting, and a spare Firestone ball lock post, and boom. Works great for me. I pump cleaner through my line, let it sit for fifteen minutes, flush, then pump water through to rinse, then pump StarSan through. Seems easier to me than putting solution in a keg, pressurizing the keg, and pushing it through with co2.
Held some gas tube in boiling water for a minute or so.
Jammed that valve stem into the tubing with a clamp.
Attached a gas fitting to the other end.
I can then fill the keg with cleaning solution, pressurize it with a bike pump and push ithe solution through the faucet followed by rinse water. On kegging day, I push starsan through the dip tube using a Picnic tap.
If I ever wanted to, I could also use the bike pump instead of getting a hand pump for parties. Plus my bike pump has a pressure gauge…
Just keep in mind BLC is not good for the keg over time, so set it up and do the job quickly; don’t store BLC in the keg. I usually push an extra batch of rinse water too, just to really clear it out.