The HSL-M Quick coupling should be used together with all the air-driven Classic and Di-PRO polishing/filing machines. In addition to making the connection to your air supply smooth and easy it also incorporates an on/off regulator which is not included on the air-driven machines themselves.
In addition to the HSL-M there is also a 3-way hose connection (item No. MFA-T2) for connecting two machines to only one MFB fog lubrication/air filtering device and a 1.5 meter air hose (item No. MFA-S) available.