Kockney Koi 8mm Chrome Airline Tap

Kockney Koi 8mm Chrome Airline Tap

This inline airline tap gives you a separate adjustment point on a compatible 8mm air hose. Use it to balance an individual air branch or to reduce the air reaching a diffuser when the arrangement and air pump permit it. The chrome-finish fitting has a hose connection at each end and a small operating handle. It is a tap for the airline, rather than an air pump, splitter or diffuser.

The price is for one tap. The Oasis supplier reference is KK564 and the manufacturer’s airline-to-airline reference is 001268-1. Choose this version when you need an inline connection between two lengths of suitable 8mm airline. The differently named airline-to-screw tap is another fitting: it should not be substituted simply because the nominal airline size is the same.

Connection and supplied item

Product	Inline adjustable airline tap
Airline connection	8mm compatible airline
Finish	Chrome finish
Quantity	One tap
Oasis reference	KK564
Manufacturer reference	001268-1

Check the actual hose and its stated size before ordering. An airline’s inside diameter and outside diameter describe different measurements; the number printed on a rigid pipe or a threaded connection is not automatically an airline size. This tap is not a reducer for 4mm hose. Airline, clips, adapters, a manifold and an air stone are supplied separately.

Balancing separate air branches

Air distribution changes with the layout of the system. A short line to a shallow diffuser can behave differently from a longer line to a diffuser working at a greater depth. An adjustable tap gives you a convenient way to make small changes to a branch while observing how the whole arrangement responds. It does not measure the air flow, so the handle position is not a calibrated litres-per-minute setting.

Start with the pump and diffuser instructions. Establish that the pump can supply the intended arrangement before trying to balance it with taps. Make one small adjustment at a time and observe the other outlets as well as the branch you are changing. The aim is an appropriate supply to the equipment concerned, rather than making every bubble pattern look identical.

Keep sufficient air outlets open for the pump’s requirements. Do not close every outlet on a running pump, or assume that a tap can make an oversized or unsuitable installation safe. If the pump needs a bleed arrangement or a different manifold, follow its instructions. Turning down a tap should not be treated as a substitute for choosing suitable equipment.

Choose an accessible fitting position

Plan a position where you can reach the handle and inspect the hose connections during routine maintenance. Avoid placing the tap where it will be buried behind equipment or where adjusting it pulls on the air pump. Allow enough hose to make a gentle route, with support where necessary. A sharply bent or trapped hose can restrict the branch independently of the tap setting.

Fit the connection according to the hose and pump instructions, with the air system stopped as required. Check that the hose is suitable for the fitting and sits securely on each end. Inspect old airline for splitting or hardening before reusing it. After reconnecting, restore the intended air supply and inspect the connections and diffuser operation. The tap has no electrical connection of its own.

Which airline should you use?

For submerged pond runs, compare the compatible 8mm options in our standard sinking airline range or Evolution Aqua heavy-duty sinking airline. Check the selected hose’s actual connection size. Sinking airline is useful where you want the hose to sit discreetly below the water rather than floating across the surface.

Our black braided airline is another option for a compatible air run, but it does not sink by itself. Allow for its routing and support if it is used in the pond. Braided hose and sinking hose are different choices; a dark colour alone does not mean that an airline is weighted.

An air tap and a non-return valve do different jobs

A tap lets you adjust or shut a branch manually. It is not an automatic check valve and it should not be relied upon to stop water travelling back towards an air pump when the supply stops. Consider the pump’s position relative to the water and follow its instructions for protecting the air system.

For a separate check-valve option, see our Kockney Koi 8mm non-return valves, pack of two. Confirm suitability and the indicated flow direction before fitting. Adding a non-return valve changes the air path, so check the resulting operation rather than assuming that every additional fitting is neutral.

Connecting and maintaining the air system

For ordinary joins or a change of direction, our Kockney Koi 8mm airline connectors perform a different role from this adjustable tap. To distribute one supply between separate hoses, compare an appropriate air manifold and check its inlet and outlet dimensions.

Include the tap and its connections in your normal equipment inspection. Check for loose hose, damaged connections and an unintentionally changed setting after maintenance. If the air delivery falls, inspect the hose route, diffuser and pump as well as the tap. An adjustable fitting provides a useful control point, but it cannot compensate for a blocked air stone or a worn pump component.