A Closer Look at Hose Couplings

1. Threaded coupling – The Clumsy Iron One

Body:

Male: Tapered metal rod, machined with pyramidal threads, pointed end with a chamfer (anti-collision teeth).
Female: Thick-walled iron cylinder with threads inside, flared inlet (guide for thread alignment).

Signs of Damage:

White grime at the thread root (raw material with residue)
Wrench bite marks on the pipe body (violent installation)

2. Cam Lock coupling – The Mechanical Tyrannosaurus Rex

Weapon Features:

Male: Short, thick metal rod with two welded "horns" (jaw chucks), grooved at the tooth root with a black rubber ring.
Female: Iron can with an L-shaped blood groove, externally mounted cast iron cam lever (resembling a guillotine scythe).

Battle Damage Traces:

Cam handle worn smooth with a copper sheen (from thousands of presses)
Aluminum teeth chipped at corners (acid corrosion/overpressure)

3. Quick-Connect Snap-on – The Refined Assassin

Weapon Construction:

Male coupling: Stainless steel tube with O-ring, annular groove machined into the tube waist (for spring locking).
Female coupling: Transparent plastic shell encasing spring-loaded steel claws, scarlet red push button for foolproof design.

Signs of Sudden Death:

Snap-on button stuck halfway (mud and sand intrusion)
O-ring swells and bubbles (gasoline immersion)

4. Flange Joint – The Heavy-Armored Rhinoceros

Armor Details:

Flange: Two cast iron discs, concentric waterstop lines machined on the disc surface, bolt holes drilled along the rim.
Combined Form: Bolts threaded through the discs for locking, washers pressed into paper-like shapes.

Near-Death Signs:

1. Bolt with rust nodules (sign of leak)
2. Pitting at the waterstop line (waiststone creep wear)

5. Barbed Joint – A Homemade Fang

Wilderness Design:

Barb core: Iron rod welded with barbs (hook tips like harpoons), wire rope wrapped between the hooks.
Death Combination: The hose opening is torn by the barbs, the wire is deeply embedded in the hose.

Prelude to Scrap:

The hose hook opening turns white (overstretching)
The wire is broken in half (stress corrosion)