Product Name:EHEIM DOUBLE TAP with quick COUPLING AQUARIUM FILTER release coupling Llave doble 9/12mm(S) 12/16mm(M) 16/22mm(L)
Feature:

Suitable for a variety of external filter and hose transfer.
Quick relase: Easy to use quick & easy installation and removal, the water flow can be adjusted freely.
Flow rate control: When the tank maintenance and cleaning can be use with water flow inlet or outlet control.
Prevent water backflow: When maintaining or cleaning the tank disassemble hose, the connector can lock the water prevent water backflow to keep the floor clean.

Usage:
Turn off control valve.
Turn the nut screwed into the body, tighten the nut set into the hose. The installation is complete.
Hold the lower part of screw connector and rotate the valves on opposite direction to disconnect the valves.


3 size for choice
9mm/12mm connector
12mm/16mm connector
16mm/22mm connector
For example, 9/12mm model can fit 9mm inner diameter hose, 12mm outside diameter hose.