92mm 4-Way Shower Flow Diverter Valve Cartridge - (54mm Brass Spindle) Tap Central Core - O Ring Push Fit
plumbing - Not sure on assembly of shower faucet - Home Improvement Stack Exchange
50 Pack Stainless Steel Filter Shower Head Seal O Ring Hose Gasket Rubber Washer with 40 Mesh for 1/2 Inch Shower Hose Heads : Amazon.co.uk: DIY & Tools
Balmoral Thermostatic Shower Cartridge
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Shower Accessories Diverter Spool 33# Shower Valve Single O Ring Push Fit | eBay
Thermostatic Cartridge for Shower / Steam Shower TMV Temperature Brass Valve Push-Fit 3 O Ring