This is a replacement pop-up waste assembly for steam showers and shower cabins with a tub base, rather than a low tray, also used on Steam Showers with Whirlpools.
Models this can be found in are
9007, 9005, 8055, 8004, 8002, 8008, 9002, 9003
Portland, Avondale, Orlando, 8004, 8002, 9002, 9002, 9007, 9005, 9004. 9001
W1, W2, W3 & ST
SP02, SP04, SP92, Sp01, SP07, SP94
Other brands/sellers include
Steam Shower Supply
Smart Price Warehouse
Please note the colour may vary between black, white and grey.