SPA SERIAL NUMBER Spa serial numbers always start with 08S-, followed by a six digit number. These numbers are found on an aluminum plate bolted to the bottom corner of the spa cabinet. SERIAL NUMBER FOR ALL OTHER PRODUCTS Product Serial Prefix Location Spas 08S-xxxxxx Serial plates are located at the bottom corner of the spa cabinet. Gazebos 08W-xxxxxx Serial plates are located on the doors, posts or lattice pannels. Saunas 08U-xxxxxx Serial plates are located on the panel above the door. Barbecues 08Q-xxxxxx Serial plates are located on the floor behind the door. Carts 08-Qxxxxxx Serial plates are located on the top left of the back panel Fireplaces 08-Qxxxxxx Serial plates are located on the top left of the back panel. Bars 08-Bxxxxxx Serial plates are located on the backside of the bottom shelf. Billiards 08-Bxxxxxx Serial plates are located on the inside panel of the short side. go back