Alb Filter Thread Guide

In this manual we will introduce you to various methods for determining the thread size of your valve. We know that even the best methods can lead to errors, so please do not hesitate to contact our support if you have any questions or problems. Your Alb Filter Team wishes you a lot of fun in determining your thread.

Content of this article

Free exchange service of the standard M24 adapter

Free adapter exchange

It is best to determine your tap thread before buying the Alb Filter Duo.

If you need a different adapter than the M24 adapter included in the scope of delivery, we will exchange it after consultation with you.

Please send us an e-mail after your order with the required adapter and your order or order number.

Which methods can I use to determine a thread?

+ + + Very precise (recommendationhlen)
+ Little accurate (not recommended) 

Thread dimensions at a glance

Have you measured your thread yet? Here you will find an overview of the common dimensions.
If your design is not listed please contact us!

M16 AG
Male thread M16 with attached measuring tape
M16.5 AG
Male thread M16.5 with attached measuring tape
M18 AG
Male thread M18 with attached measuring tape
M18.5 AG
Male thread M18.5 with attached measuring tape
M19 AG (rare)
Male thread M19 with attached measuring tape
M20 AG
Male thread M20 with attached measuring tape
M21 AG (rare)
External thread M21 with attached measuring tape
M21.5 AG (rare)
External thread M21.5 with attached measuring tape
M22 AG
Male thread M22 with attached measuring tape
M24 AG
External thread M24 with attached measuring tape

Instructions for determining your thread size

Preparation

Step 1:
Remove aerator / aerator regulator

Most water taps have a jet regulator, also called aerator. To determine the thread, we have to unscrew it.

Unscrew the aerator / jet regulator from the water tap

Step 2:
Determine thread connection form

External thread

An external thread is when the serration,
as in this illustration, faces outwards.

The thread is always measured at the outer edge of the serration.

Sketch external thread
Internal thread

An internal thread is when the serration points to the inside.

The thread is always measured at the inner edge of the serration.

Sketch internal thread

Measuring method I

Caliper gauge (analog / digital)

Determination of an external thread (AG)

The thread is measured at the outer edge of the serration. To do this, position the caliper gauge as shown in the following figure and read off the value.

Digital caliper gauge for determining thread sizes for water filters on the tap
Determination of an internal thread (IG)

The thread is measured at the inner edge of the serration. To do this, position the caliper gauge as shown in the following figure and read off the mm value.

Analogue caliper gauge for determining thread sizes for water filters at the tap

Measuring method II

Ruler / measuring tape

Determination of an external thread (AG)

Place the zero value of the ruler on the outer edge of the serration. Now read the mm value on the opposite side of the thread.

NOTE: The external thread makes it easier to determine an AG with the ruler than an IG.

Aerator / jet regulator Measuring external threads with the aid of a ruler
Determination of an internal thread (IG)

Place the zero value of the ruler on the inner edge of the serration. Now read the mm value on the opposite side of the thread.

Aerator / jet regulator Measuring internal threads with the aid of a ruler

Measuring method III

Euro coins comparison (not exact)

Still having trouble?

Here they get support

Photograph your faucet aerator / aerator with tape measure, ruler or calipers attached. Proceed as follows:

  • Place the unscrewed aerator on an even surface and photograph it from above at an angle. The side with the thread must be on top.
  • Hold a tape measure (preferably a vernier caliper), or alternatively a folding rule, diagonally across the thread of the aerator. Here it is important that we can estimate how wide the diameter is.
  • Finally, we need a picture of your faucet to better assess the connection situation (is the shower head perhaps unsuitable?).

Send the pictures to us: info@alb-filter.com