If your Comet Static 1700 inlet connection doesn't match up, leaks, or seems backward, you are missing the inlet adapter. You need to put a brass Female BSP to Female GHT part in your OE Comet accessories bag on the pump first. Without this adapter, the pump has a male 3/4" BSPP thread incompatible with our US garden hoses, which should be 3/4" GHT.
Here's the flow pattern of this setup:
Hose Bib --> Female GHT Coupler --> Male GHT Plug --> Female end of hose --> Male end of hose --> Female GHT Coupler --> Male GHT Plug --> Female to Female Adapter --> Pump Inlet
NOTE: Some new Comet machines have a different inlet adapter. Some are larger; some are other materials altogether. If you want something better, get this: Brass Pressure Washer Inlet Adapter for Garden Hose.