The adaptation of the tool expects Telekopstange which is the recording .A plugging, as known from the broomstick not possible here. I had a Telekopstange of a paint roller (stable and long) ... but had to tinker quite to connect with it.
When tubing is connected, one should perhaps opt for the 32mm - a little less bulky and less heavy the filled tube. No advantage with 38mm (which I chose) when flow is anyway tapered at the brush and hand pumps to 32mm.