EK-AF Extender 12mm M-M is suitable to connect two fittings/Adapters with female G1/4 threads. For example PVC tube Fitting on one side and Hard/Rigid Acrylic tube fitting on other side.EK-AF Extender M-M is a simple male-threaded extender interconnect for connecting two water cooling components with female G1/4 threads together.This is not a revolvable extender.Made fromblack nickel-plated CNC machined brass. Sealed with quality orings.These Extenders can be either tightened by hand or by using Allen Key 9mm (not included, available for separate purchase).Technical data:- Threading: 2 x G 1/4\" (Male - Male)- Thread length: 4.0mm- Diameter: 18.8mm- Height: 12mm