RY-EA-EH4 Yellow Twin-Head Eyewash Spray Tube Assembly with Side-Hinged Caps

RY-EA-EH4 Yellow Twin-Head Eyewash Spray Tube Assembly with Side-Hinged Caps

Product Overview

The RY-EA-EH4 is a twin-head eyewash spray assembly moulded in yellow plastic: two nozzle cups carried on curved arms that sweep out and up from a central body, each cup holding a stainless mesh strainer disc under a side-hinged flip cap, with a male threaded shank and flange underneath for mounting through the eyewash bowl. The wide U-form sets the two streams at eye spacing across a broader span than a compact head, and the caps hinge outboard so that when they are flipped open they swing away from the water path rather than across it. It is supplied as a complete assembly for stations that use this wide pattern.

The Span Is Fixed, and That Is the Point

This head is shaped to place two nozzles a specific distance apart, and that distance is what makes the streams land on two eyes instead of on the bridge of the nose.

Geometry cannot be adjusted. The arms are moulded, not jointed, so the spacing between the cups is whatever the mould says. That is a strength — the head cannot be assembled out of alignment the way a stack of elbows can — and a limitation: if the station's bowl or column does not suit this span, the head is simply the wrong part. It also means a bent arm cannot be straightened back into tolerance; the assembly is replaced.

The wide arms load the shank. A broader head puts more bending moment on the mounting shank than a compact one, and the flange that seats on the bowl takes it. Over-tightening the nut under the bowl is the usual way this fails: the plastic flange cracks, the head sits down at an angle, and the streams no longer converge where they should. Hand plus a part turn, never a wrench.

Outboard hinges keep the water path clear. Caps that hinge forwards can hang over the nozzle mouth when open and disturb the stream; caps that hinge sideways swing clear. The trade is that an open cap now sticks out sideways where it can be snagged by a sleeve or a passing trolley, and the hinge pins are small parts that can work loose. Both are worth checking on a walk-round.

The strainer discs are the flow control in practice. Fine stainless mesh catches grit before it reaches the waterway, and when one side of the head runs weak the disc is the first suspect. They are not designed to be poked: back-flush or soak, and replace a disc that has been pushed in or deformed.

Plastic on a wide span. The material tolerates tepid water and typical lab chemicals and will not corrode, but it is temperature-limited — a hot flush can soften a head that is already carrying a wide span — and it degrades under sustained UV, so this belongs on an indoor station rather than an exposed one. Where the station is outside or is periodically flushed hot, a metal head is the better choice.

Key Features

• Wide U-form body moulded in yellow plastic, setting the two streams at eye spacing across a broad span.

• Two nozzle cups each with a stainless mesh strainer disc to catch grit before the waterway.

• Side-hinged flip caps that swing outboard, clear of the water path when open.

• Male threaded shank with flange and nut for mounting through the eyewash bowl.

• Fixed moulded geometry, so the head cannot be assembled out of alignment.

• High-visibility yellow, readable against a stainless or plastic bowl.

• No metal in the water path except the strainer discs, so nothing to corrode at the threads.

• Supplied as a complete assembly, so a cracked flange or a damaged hinge is fixed in one swap.

• Individual packing, so the moulded cups arrive without scuffs.

Technical Specifications

Fitting

1. Isolate the station supply, lock the valve off and release pressure before removing the old head.

2. Check the bowl cut-out and the existing nut and washer; confirm the new span suits the bowl before fitting.

3. Check the thread by hand for full engagement, then tighten the nut under the bowl by hand plus a part turn — the plastic flange cracks under a wrench.

4. Restore the supply slowly, open both caps and check that the two streams converge at eye position and that neither sprays outside the bowl.

5. Confirm both caps seat flat when closed and swing fully outboard when open without resting on the nozzle mouth.

6. Re-check the nozzle height above the floor and the distance from the wall, and record the flow reading with the caps open.

Maintenance and Inspection

Weekly: open both caps, operate the station for at least three minutes, and confirm both streams are full, evenly spaced and aimed correctly.

Monthly: back-flush the strainer discs and look through them against a light; check the hinge pins are seated and the caps still swing outboard.

Quarterly: check the flange and shank for cracks and the arms for deformation; confirm the head still sits square in the bowl.

Annually: replace the assembly if a hinge pin is missing, a cap no longer seats, an arm is bent, or the moulding has gone chalky or brittle.

Standards and Compliance

This head is a component of an emergency eyewash; the installed station must meet ANSI Z358.1-2014 in full — fifteen minutes of flushing with tepid water at 20–37 °C, hands-free activation, nozzles at the required height above the floor and clearance from the wall, unobstructed access within ten seconds of the hazard, and a controlled twin stream at a velocity the casualty can tolerate with the eyes held open. The fixed span of this head is what delivers the two streams to two eyes, so a distorted or wrongly specified span cannot be corrected at the station. Covers must be present and functional at every inspection, and the height and aim must be re-verified after fitting.

Applications

Replacement heads on eyewash stations that use the wide twin-head pattern, ABS and stainless bowls where a broader stream spacing is wanted, laboratories and indoor workshops on a controlled tepid supply, and spare-part stock for maintenance teams.

Ordering

State the model RY-EA-EH4, the shank thread size or the make and model of the bowl it is to fit, the quantity, and whether spare strainer discs are to be included. Confirm the bowl diameter and cut-out, since the span of this head is fixed and must suit the station. If the station is outdoors or is periodically flushed hot, ask about the stainless twin-head alternative — the moulded body is temperature-limited and degrades under sustained UV.