You can store your cleaning thinner in the extra cup by putting a cap on it

4801 W-300 W300-081G GUN/CUP(PCG4D-2)

Capacity: 550 pounds

Cast Iron 2-Stage Inline V-Twin Replacement PumpProvides maximum performance and efficiencyProduces 7

Power transfer: V-belt drive

Merkur Wet Cup Pump Assembly, 28:1, 125 cc Lower, 3 UHMWPE/2 PTFE Packings with Chromex, DataTrak, Low Noise, SST 535 ft. You can store your cleaningUPC Product: 00633955451827 Family Code: FAMCPP Unit of Measure: EA Height: 17 IN 43. 18 CM Length: 35. 5 IN 90. 17 CM Width: 16 IN 40. 64 CM Volume: 5. 588 FT3 . 158 M3 Chargeable Weight: 69. 8 LBS 31. 66 KG Technical Specifications Type Rod