Source 10mm 12mm electric heating element waterproof watlow cartridge heater with stopper flange on m.alibaba.com
Watlow FR-E1J35 Firerod Cartridge Heater with standard 12 in Crimped-on Leads 250 W 240 V 1/4 in (.250) Nominal diameter x 1.5 in length 5 PACK - Thermal Devices - Thermal Devices
Watlow FireRod Cartridge Heater 8444 240V 140W AFTC 214 1/4" Dia 2 1/4 L #1073c4 | eBay
Firerod 240 V, 300 W Cartridge Heater - Price, Specs