Privy vaults can only be connected with the sewers through intervening receiving basins, and the outlet pipes from all such vaults must not be less than two feet (2') above their bottoms so as to retain all solid matter, and effectually prevent anything but the liquid contents of the vault from passing into the drainage pipes and receiving basins. All discharge pipes leading from kitchen sinks, laundry and stationary wash stands, or any other receptacles likely to contain grease in any form, shall make direct connection with and discharge their contents into receiving basins; and all bath tubs, water closets, hand basins, etc., shall connect direct with the main drain.