The following details have been released via a Service Bulletin from Apeks earlier this month
“It has come to our attention that, although it negates the warranty, some people are changing the hose on Apeks regulators to the Miflex hose. There could be difficulty when fitting a standard Miflex hose to any Apeks regulator.
Due to the design of the Miflex swivel hose, there is very little room for a standard 11/16†spanner to be used to tighten the hose connection, therefore if fitting this hose you must adhere to the following:
The torque setting for the hose connection is 5Nm as stated in your regulator CD owners manual. If there is no torque wrench available, the heat exchanger nut must be held whilst tightening the hose nut to the second stage, this can only be achieved with the use of a slim fit spanner.
Due to the design of all Apeks swivel hose connections, standard spanners can be used with all Apeks hoses.
Please note, this will not affect the Flight regulator which has a non tool connection.
Please note unforeseen difficulties can arise when fitting Non Apeks equipment to our products, which is why it is only recommended you assemble Apeks manufactured parts. If a lightweight flexible hose is required we would strongly recommend that the Apeks Lightweight hose be used. The part number for the lightweight regulator hose is AP0198 and the lightweight octopus hose is AP0199″
More details are available by contacting an Authorised Apeks Distributor or through Apeks themselves
UPDATE: See new Amendment from Apeks