https://huizeinox.en.made-in-china.com/product/sBwxjlhvlDRU/China-OEM-Lost-Wax-Valve-Body-Castings-Accessories.html
OEM Lost Wax Valve Body Castings& Accessories - Pump Valve Bodies and Pump Valve Casting
lost waxvalve bodypump bodiesoem
https://www.popsci.com/sea-spiders-pump-oxygen-using-their-guts/
Sea spiders use their guts to pump oxygen through their freaky little bodies
Many of us think with our stomachs, but researchers on an Antarctic expedition have discovered a creature that uses its gut for a heart.