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McAlpine WHB-1 Wash Hand Basin Self Closing Valve Hand Wash Basin

4.5 (61 reviews)
SKU: 240301125809003 EAN: 5036484511386

Compare 1 price for McAlpine WHB-1 Wash Hand Basin Self Closing Valve Hand Wash Basin — from £18.01 across 1 UK seller including Screwfix.

£18.01 10h ago
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1 1/4" BSP Female Inlet x 1 1/4" Universal Compression Outlet. Designed to allow full use of storage space below the basin within the cabinet or furniture. The internal membrane opens under water pressure to allow discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building. The valve allows air to be drawn into the discharge waste pipe when negative pressures occur and eliminates the need for secondary ventilation to the discharge pipework. This allows for greater flexibility in the plumbing design. The valve can be easily cleaned without having to disassemble the discharge pipework. Simply remove the split pin at the front of the valve, take out the plug and membrane and clean in hot soapy water. Reassemble and relocate the split pin in the slot provided. • Overall height 62mm. • 1¼" BSP female inlet nut x 1¼" universal compression outlet
Brand McAlpine
Features Push-to-Connect
Item Height 62 mm
Material Plastic
MPN 372WHB-1
Number in Pack 1
No features listed
No items listed

Customer Reviews 61

4.5
61 reviews
5 star
49
4 star
3
3 star
2
2 star
2
1 star
5
Excellent space saving trap.
5.0
February 1, 2026
SDRaffey Verified Purchase

Excellent shallow trap, saves on space, easy fit, seals well.

Looks great, didn’t work for me
1.0
January 11, 2026
JFBuilds Verified Purchase

Not great, it worked 50/50 the seal wouldn’t always snap shut and would let sewer gasses back into the bathroom so I returned it for a full refund.

Brilliant Product
5.0
December 11, 2025
AJM Verified Purchase

Brilliant product. Solved what I thought was going to be a major issue in a restricted space

Leak
1.0
October 26, 2025
aurwscx5w0pde3wlw83v7p68l

" I’ve been through two of these. Both leaked from the inspection cap.

Don’t waste your time or money. "

Good and small! Perfect for wall hung sinks
5.0
August 4, 2025
Flying Dutchman Verified Purchase

Good and slim. Good for wall hung sinks! No leaks and good quality. Other sites say that this leaks from the end but not experienced myself.

In and out of the way
5.0
July 28, 2025
Xacity Verified Purchase

This was ideal to use on a new vanity unit as unlike most traps it isn't seen and leaves all the cupboard space clear to use.

Good trap!
5.0
July 1, 2025
a3a7ba63-2458-52b9-a2ad-39406f72ccd1 Verified Purchase

Really good trap for basins where space is limited underneath it basin units with draws!

Mcalpine whb shallow trap
5.0
June 10, 2025
f0m0orsgo7qfpe94h9rfuzn9j Verified Purchase

Decent product. Sceptical on how long it will self close

Waste for right spaces
5.0
February 4, 2025
AM786 Verified Purchase

Very good for right spaces, excellent for vanity units

Waste of time and money
1.0
January 31, 2025
Ron ja Verified Purchase

don't buy this waste fitting you can not stop it leaking

Great product and easy to install.
5.0
January 19, 2025
Deano16 Verified Purchase

Really good trap for tight spaces. Leaves lots of space for drawers.

Useful
5.0
November 11, 2024
M reidy Verified Purchase

The only waste that I could use with the sink unit but was very expensive

Great job
5.0
November 7, 2024
DIYDave1962 Verified Purchase

Just the job for my vanity sink installation,easy to fit,was up and running in minutes.

Simple and works
5.0
November 2, 2024
Hisf Verified Purchase

As usual with this brand it’s well made kit. As Leo has an access port for cleaning the bladder - any buyers note it is essential to keep the bladder clean to ensure it works properly. So if you’re stuck with a basin arrangement that doesn’t allow for the standard p-trap or any other solution then this space saver is a product worth using.

Excellent for bidet and basin
5.0
October 22, 2024
semmyroundel Verified Purchase

I had to plumb in a bidet that only had an aperture at the rear for the trap, the water supplies and a pop up waste mechanism-so v. little room.
This trap enabled this to happen where a regular p trap wouldn't.
The added bonus was that being waterless, and a bidet being used infrequently, it wouldn't allow smells that would've come in a regular trap where the water evaporates. Win Win.

Expensive but you save on a heap of joints
5.0
September 9, 2024
Gazzas Verified Purchase

I spent ages looking for small bottle traps / u bends only to come across these which take up no room at all …no sawing of expensive cabinetry and cleans & simple plumbing it was for a double wash basin . Great find and it all works so very well .

Excellent
5.0
June 23, 2024
SBu Verified Purchase

Did the job perfectly. Great product at a good price.

Useful alternative
5.0
June 15, 2024
Mr Moose Verified Purchase

Needed this in a vanity unit so as not to obstruct the drawer. Worked well and being McAlpine it should last.

This trap was ideal for the job
5.0
April 1, 2024
Wafu Verified Purchase

Fitted a new sink unit with drawers. This trap was ideal for the job. No traps hanging down and waisting space.

McAlpine Waterless trap basin/bedit trap.
5.0
March 27, 2024
K W Lee Verified Purchase

The plumber botched the first waterless trap. It was not screwed to the bidet but used mastic to hold the trap in place. I assumed the trap was difficult to fit as it was a single long piece. I replaced it with a standard bidet trap but it makes a irritating popping noise when the seal is pulled. Finally I changed it to the waterless trap in conjunction with a straight connector to make up the correct length. This also provided sufficient adjustment for installation. I like the removable diaphragm for cleaning. I would assume that the diaphragm will require cleaning after a period of use to maintain its performance.

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