draincock

As nouns the difference between draincock and null

is that draincock is a tap or valve used to draw off water (or other liquid) from the lowest part of a tank, boiler etc while null is zero, nil; the cardinal number before einn.

As nouns the difference between boiler and draincock

is that boiler is (tank-type) water heater while draincock is a tap or valve used to draw off water (or other liquid) from the lowest part of a tank, boiler etc.

As a verb tank

is .

As a noun draincock is

a tap or valve used to draw off water (or other liquid) from the lowest part of a tank, boiler etc.

As nouns the difference between water and draincock

is that water is (uncountable) a chemical, found at room temperature and pressure as a clear liquid, having the formula h₂o, required by all forms of life on earth while draincock is a tap or valve used to draw off water (or other liquid) from the lowest part of a tank, boiler etc.

As a verb water

is to pour water into the soil surrounding (plants).

As nouns the difference between valve and draincock

is that valve is a device that controls the flow of a gas or fluid through a pipe while draincock is a tap or valve used to draw off water (or other liquid) from the lowest part of a tank, boiler etc.

As a verb valve

is to control (flow) by means of a valve.

As an initialism tap

is .

As a noun draincock is

a tap or valve used to draw off water (or other liquid) from the lowest part of a tank, boiler etc.