HaruDesign CO2 Regulator R4000-LS Set [Used]

Purchased the full set from HaruDesign's online shop in November 2025 and used it for approximately 6 hours a day until the end of April 2026.
There were no operational issues up to the point of removal.

The parts included in this listing are as follows:
Photo 1: Regulator + Bubble Counter (refer to Photo 6 for the lid)
Photo 2: AC adapter for the above
Photo 3: Adapter for connecting to large CO2 cylinders (unused)
Photo 4: Resin base for small CO2 cylinders
Photo 5: Acrylic CO2 Diffuser FLAT32 (High-density ceramic slice has been sterilized and cleaned with hydrogen peroxide)
Photo 6: Check valve and lid for bubble counter
Photo 7: Spare pressure-resistant hose (to connect the bubble counter and check valve)
Photo 8: U-shaped pipe for attaching to the aquarium rim (unused as it did not fit the rim thickness)
Photo 9: Tools (wrench) and packing for the large cylinder adapter? (unused)
Photo 10: Tools (spanner)
In addition to the above, 4 suction cups (unused, not pictured) and an instruction manual (Photos 12-13) are included.
Photo 11 shows a High-density ceramic slice purchased additionally as a replacement, which will be included. This has also been used once but has been sterilized and cleaned with hydrogen peroxide for this listing.

However, the cartridge-type small CO2 cylinder that was originally included in the set has been used up and is not included in this listing.

The pressure-resistant hose connecting the check valve (left end) and the bubble counter lid (right end) in Photo 6 is used. We recommend replacing it with the spare pressure-resistant hose (see Photo 7).
Also, the normal soft tube attached to the acrylic pipe of the diffuser in Photo 5 (connecting this end to the check valve) is used. We recommend replacing it with your own soft tube.

We regret to inform you that returns cannot be accepted. Furthermore, we are not considering price reductions at this time.