Hansen Check Valve Hi-Flo 40mm Lids and Bands It is made from heavy-duty

It is made from heavy-duty plasticated polyester film

with the advantage that you can double stack them on top of each other as the lid is flat (you need to put in a rack or something flat if you are trying to stack Fowlers Vacola bottles due to the clips on top)

while the outer bottom rim holds the pan up off the ground so

and other poultry

Hansen Check Valve Hi-Flo 40mm Lids and Bands It is made from heavy-dutyPrevents fluid reverse flow Fast open close response Smooth valve opening at just 1 PSI Compatible with BSPT thread "Hansen HiFlo check valve is used in line to stop fluids reverse flowing in the pipe. The unique Hansen design reduces flow restriction to the minimum. The screw cap allows for easy valve access for service or replacement of diaphragm and spring. (Replacement diaphragm and spring sets are common to both check valves and foot valves of