https://evolutionaqua.com/black-threaded-nut
Black threaded nut - evoUV black end cap
Replacement black end cap threaded nut that screws onto white locking nut on all models of evoUV.
black threadednutendcap
https://kitsukoi.co.uk/products/evouv-t8-lamp-holder
evoUV T8 Lamp Holder - Kitsu Koi - Koi & Pond Equipment
T8 lamp holder for use with all Evolution Aqua inline evoUV Ultra Violet Clarifiers.
lamp holderkoi pondkitsuequipment