Ka taea te whakakotahi i nga paera poi me te kaitahuri pneumatic (pneumatic ball valves) me te hiko hiko (electric ball valves) mo te aunoatanga me te / mo te whakahaere mamao ranei.I runga i te tono, ka pai ake te mahi aunoa me te kaitahuri pneumatic me te hiko hiko, he rereke ranei.