The STAUFF permanent charge head allows accessory equipment to be mounted directly onto the gas side of an accumulator. For accumulators already installed in a system, the pre-charge pressure must be at zero pressure, then the existing gas valve fitted to the accumulator can be removed. The STAUFF permanent charge head is supplied as standard with a STAUFF SKK-20 test coupling, which can easily allow other STAUFF accessories e.g. Safety pattern analogue pressure gauge, PT-RF pressure sensor or DIGI gauge to be fitted to the charge head.