Plumbing Supplies
Kerick Valve PF08-516 Polyethylene Sphere Float Ball, 8" Diameter, 8" Length, 5/16" Female Thread,Black
For use with 1-1/4" and 1-1/2" inlet float valves and 5/16"-18 threaded rods (sold separately) Polyethylene for chemical resistance 5/16"-18 female threads for mounting Molded in one piece to resist leakage
https://www.bizrate.co.uk/plumbingsupplies/kerick-valve-pf08-516-polyethylene-sphere-oid25918511156.html