Here are the technical drawings for each model of Pre-rinse assemblies. Please click to enlarge

FAQ

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Yes, the minimum pressure rating required is 20 PSI or 1.379 Bar

It is quite common for pre-rinses to be installed on mains cold supply, but on a tank fed hot supply, the resulting water supply may not be adequte. All our pre-rinse sprays are of the same basic design and do not operate well at low pressure.

If unbalanced supplies are being experienced when using mixers (i.e low on one side compared to the other), a simple test to proform is to turn the pre-rinse spray around and connect the hot supply to the cold and the cold supply to the hot. If the side that was running well is now running poorly, this indicates a site supply problem and there is nothing wrong with the pre-rinse unit.

A low-pressure supply will affect the Pre-Rinse Spray unit's performance. It is important to have the minimum water pressure on site to realise optimal operational levels.

If the site supplies are inadequate, sometimes booster pumps are fitted to the supplies to assist water flow.
 

Is there a way of making the quarter turn a full turn on the taps?

Yes, the drawing below explains how to.

I am getting good water flow through the taps in my kitchen, but not so good through the pre-rinse, even though they are on the same supply.
 

Carry out all of the checks listed above, but there are fundamental reasons why a tap will provide a better flow than a pre-rinse. A tap has a direct water path i.e. when you turn it on, a water path is opened and the water flows.

Pre-rinses have built-in, non-return valves to prevent the hot and cold water cross-contaminating. The non-return valves naturally cause resistance against the water as it flows. This is why we specify 1.379 bar (20 psi) as a minimum water pressure for all units.

If still problems with pressure on site, a booster pump may be required.

The riser tube is wobbly or worse has snapped on my pre-rinse unit.

This probably means that the wall bracket either hasn't been fitted or hasn't been fitted properly. Either replace the wall bracket,     B-109-3 (12") or just the riser tube. Riser tubes can be purchased as a replacement part. If you have a basic unit
without an Add-on-Faucet the part code is 374-40 (28"). If you have an Add-on-Facuet you will require a shorter riser (21")
371-40.

Is it possible to add an Add-on-Faucet to an existing Pre-Rinse Spray unit?

Yes. The Add-on-Faucet is code B-156 However, you will need to change the rise tube to a shorter version or the unit will be too high for your requirements a shorter riser (21") is code 371-40.

My pre-rinse hose has split.

Pre-rinse sprays are often subjected to continuous abuse on site. Sometimes the use of the pre-rinse unit is used to wash out the inside of the dishwasher, or to fill buckets on the floor this use of the pre-rinse can cause over stretching and use beyond its design capabilities.

It is very unusual for a hose to split if it is being used as it is designed to together with the safety return spring. If however your hose has spilt you will need to order a B40H as a replacement.

The spray gun on my pre-rinse won't close (runs continuously, or drips)
 

After a long term of useage commonly the spray gun trigger will loose its sprung loaded self closing mecanisim. This is a

replaceable part by either replacing the bonnet assembly (2856-40) or by stripping the gun and replacing the spring itself.

The spring is part of our gun repair kit (B-10K).