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Draft

Coupler & Fitting Guide

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A System

Coupler: European Slider
CAUTION: A System looks very similar to the M System!
Identifying Marks:

1. Circular flat steel head allowing the coupler to slide on.

2. Flat steel head in the center of the rubber ring (This distinguishes if from the M System which has a metal sphere in the center of the rubber ring).
D System

Coupler: American Sankey
CAUTION: D System looks very similar to the S System!
Identifying Marks:

1. Recessed coupler entry allowing the coupler to twist in.

2. Usually the fitting has a steel sphere in the center of the rubber ring however it can also have a small flat steel head instead.

3. The D System differs from the S System by the amount the entry connection is recessed from the top of the fitting. The S System is recessed twice. The first time is from the top to a steel ring and then the entry is recessed once again. The D System is only recessed once from the top to the entry.
G System

Coupler: Grundy
Identifying Marks:

1. Circular flat steel head with three sides cut. It looks like circle that has been cut to fit inside of a triangle.

2. Flat steel head in the center of the rubber ring.
M System

Coupler: Schneider / Einbecker
CAUTION: M System looks very similar to the A System!
Identifying Marks:

1. Circular flat steel head allowing the coupler to slide on

2. Metal ball in the middle of the rubber ring (This distinguishes it from the A System as that has a flat metal head in the middle of the rubber ing)
S System

Coupler: European Sankey
CAUTION: S System looks very similar to the D System!
Identifying Marks:

1. Recessed coupler entry allowing the coupler to twist in.

2. Usually the fitting has a small flat steel head in the center of a thin rubber ring however it can also have a steel sphere instead.

3. The S System differs from the D System by the amount the entry connection is recessed from the top of the fitting. The S System is recessed twice. The first time from the top to a steel ring and then again from the steel ring to the entry. The D System only is recessed from the top to the entry.
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