Can I use this valve to reduce the flow rate/pressure into a tap?

Hi, we use it as a strait open or shut valve to drain a motor home fresh water tank but because it’s a rotational action the. Flow can be variable, so I would say the answer is yes.

Does it turn off clockwise ? So stiff I cant move it and dont want to force it.

the JOHN GUEST - 15MM EMERGENCY SHUT OFF TAP does turn off clockwise, the stiffness is to ensure that no excess water is dripping through the tap.

Can these be used on a rubber cold water pipe?

They could but its not 100% what its designed for

Would this be suitable for between an hot water tank & inlet to shower pump?

I can’t see why not. I have them fitted to my shower and generally have had no problems with JG push fit fixings or plastic piping so far

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JG Speedfit 15mm Emergency Shut Off Valve Push Fit Isolation Tap for Copper & Plastic Pipe

Product ID: 51828560

Details

Brand
John Guest
Exterior finish
painted
Inlet connection size
15 Millimeters
Inlet connection type
Push-fit
Item dimensions L x W x H
15 x 11 x 3.6
Material
Plastic

⚡15mm push-fit speedfit connection

🛠️Tool-free emergency shut-off valve

🇬🇧UK-made durable plastic build

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168 zł

Duties & taxes included

In stock

Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚨 Shut it down fast, stay worry-free!

PUSH FIT PRECISION - 15mm speedfit connections ensure leak-proof, tool-free installation in minutes.
COMPACT LIGHTWEIGHT - Slim 15 x 11 x 3.6 cm design fits discreetly in tight plumbing spaces.
DIY FRIENDLY PRO APPROVED - Engineered for both professionals and savvy homeowners to install with confidence.
INSTANT CONTROL ZERO HASSLE - Emergency shut-off valve designed for rapid response and easy operation.
BUILT TO LAST MADE IN THE UK - High-quality plastic construction meets WRAS standards for reliability and safety.

The JOHN GUEST 15MM Emergency Shut Off Tap is a WRAS-approved, UK-manufactured plastic valve featuring a 15mm push-fit speedfit connection for quick, tool-free installation. Designed for emergency water shut-off, it offers durable, leak-proof performance trusted by professionals and DIYers alike.

Specifications

ASIN	B00AFT9W46
Best Sellers Rank	44,647 in DIY & Tools ( See Top 100 in DIY & Tools ) 58 in Traps
Brand	John Guest
Country of Origin	United Kingdom
Customer Reviews	4.6 4.6 out of 5 stars (321)
Exterior Finish	painted
Included Components	Connector
Inlet Connection Size	15 Millimeters
Inlet Connection Type	Push-fit
Item Dimensions	15 x 11 x 3.6 centimetres
Item Weight	0.04 Kilograms
Manufacturer	JOHN GUEST
Material	Plastic
Model Number	15MM EMERGENCY SHUT OFF TAP
Number of Ports	2
Outlet Connection Size	15 Millimeters
Outlet Connection Type	speedfit
Part Number	15ESOT
Specification Met	WRAS
Unit Count	1.0 count
Valve Type	Emergency shut-off valve

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