(Drain Valve) A plastic or brass valve located near the bottom of the water heater that allows the tank to be drained when the water heater needs to be replaced and also permits periodic partial draining by the homeowner to flush out sediments that may have accumulated in the bottom of the tank.
(Drain Valve) A valve located at the bottom of a spill container to drain accumulated liquid into the UST. Drain valves, depending on the type, may be activated by pulling a chain, pushing a rod, or pulling a lever.
(DRAIN VALVE) Used in the draining of the spa, looks like an outdoor faucet and fits a standard garden hose.
Containing or operated by air or gas under pressure
of or relating to or using air (or a similar gas); "pneumatic drill"; "pneumatic tire"
(pneumatics) the branch of mechanics that deals with the mechanical properties of gases
(of certain body parts, esp. a woman's breasts) Large, as if inflated
(chiefly of cavities in the bones of birds) Containing air
(pneumatically) in a pneumatic manner; "at the present time the transmission is very often done hydraulically or pneumatically"
Outlet valve
This picture shows the filter outlet valve on the same system. This valve involves electrical, pneumatic and fluid flow elements and if it was to be stripped down the system would require careful draining down and isolation of electrical and pneumatic systems before work could commence.
Fumoto Valve clearance
Looks like even the nipple version is still protected by the jacking
plate.