I filled the party pig and without really thinking about it I put the restrictor plate behind the nozzle. The restrictor plate, as the name suggests, is designed to limit the flow of fully pressurized beer so you don't end up with glass after glass of foam. With a pressure pouch it works great but as the pressure starts to diminish in the pig the pour turns more into a gravity pour but the restrictor plate causes the beer to pour out very, very slow. I should have left it out since I didn't have the pressure pouch trying to shove beer out. So in a second pass at using the party pig as a cask/gravity vessel I would leave the restrictor plate out and see if it improves flow without allowing more oxygen to flow in and spoil the beer quicker.
I filled the party pig four days after fermentation began. Brewing a 4% beer with S-04 meant fermentation was complete within a day or so. The beer was still full of diacetyl but I expected the yeast in suspension would slurp it all up before consumption. I then let it mature for a couple weeks before tapping it. When I filled it the walls of the pig were very flexible. A few days later there was a little more pressure but not nearly as much as the pig would have with the pressure pouch. I tapped it, drank a few pints, and then put it in the fridge. It stayed in the fridge for about a week and a half before I drained off some more pints. Then repeated each weekend until it was empty.
Tasted on day thirteen and unfortunately the beer is showing signs it's on it's way out. It's still drinkable but it's definitely showing signs of oxidation well past its prime. The fruity flavors are starting to fade out to hints of cardboard-like stale flavors. I plan on finishing it off this weekend (around day fifteen or sixteen) which is probably the limits on this beer. I used a pint to make some spent grain bread so that left about half a gallon to polish off.
Finished the cask on day seventeen. The mild was still drinkable but definitely showed some signs of oxidation. It was completely flat by the last couple pours.
Overall I think it held up fairly well for beer sitting on that much oxygen but I probably wouldn't have felt comfortable giving it to guests as something I was proud of after a week or so when it started to oxidize. Overall the experience was about what I expected but I'd rather not want to drink flat, slightly oxidized beer so I think the party pig makes more sense in this cask format as something drank at one time (you know, at a party). I have some ideas about ways to prolong the life and prolong the carbonation but I'll wait to discuss them until I have a chance to think through it some more.