| AIRLOCK | A bubble in a pipe obstructing the flow of liquid (7) |
| LOCK | Short section of a canal for raising or lowering a barge or narrowboat; or, an air-bubble in a pipe obstructing the flow of liquid (4) |
| BLEW | Made a bubble, in a way |
| SPIGOTS | Devices for controlling the flow of liquid in a faucet |
| BOURDON | The heaviest bell of a carillon; the drone of a bagpipe; or, derived from a French word meaning "bumblebee" or "buzz", a 16-foot stopped-flute in a pipe organ (7) |
| CONSOLE | A kind of ornamental bracket; an ensemble of stops and keyboards in a pipe organ; or, a cabinet (7) |
| BLISTER | Air bubble in a coat of paint |
| TRICKLE | Gentle flow (of liquid?) (7) |
| DRIBBLE | Tiny flow of liquid (7) |
| DOTTLES | Remnants of tabacco left in a pipe after smoking (7) |
| LEAKAGE | Problem in a pipe emerging from e.g. a lake (7) |
| AERATOR | Device making bubbles in a fish tank |
| RESUMED | Putting an amount in a pipe started again (7) |
| GROYNE | Erection affecting the flow of liquid in the genital area, reportedly |
| BALLCOCK | A device for regulating the flow of liquid into a tank, cistern, etc (4,4) |
| SEED | Unit of botanical life such as an acorn, bean, conker, kernel, key, nut, pea, pip or stone; a fragment of coral; a bubble in glass; or, a small crystal from which a larger one is grown (4) |
| VALVES | Devices for controlling the flow of liquid (6) |
| SPIGOT | Peg or plug which controls the flow of liquid |
| STOPCOCK | Valve controlling the flow of liquid or gas (8) |
| TAP | Device controlling the flow of liquid |
