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 speed connection

💧Instant water isolation in emergencies

🛠️No soldering or glue needed

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€ 41.94

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Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚰 Shut it down fast, stay leak-free longer!

MAINTENANCE FRIENDLY - Easily removable fittings for quick adjustments or future upgrades.
EMERGENCY WATER CONTROL - Shut off water flow instantly during repairs or unexpected leaks.
LEAD FREE DURABLE BUILD - Crafted from premium, safe materials for long-lasting reliability.
VERSATILE COMPATIBILITY - Works seamlessly with 15mm copper, PEX, and PB plastic plumbing systems.
RAPID PUSH FIT INSTALLATION - Connects effortlessly to copper & plastic pipes—no tools, no fuss.

The JG Speedfit 15mm Emergency Shut Off Valve offers a tool-free, push-fit solution for quick isolation of water flow in domestic plumbing. Compatible with copper and plastic pipes, it features a lead-free, durable design that ensures secure connections and easy maintenance—perfect for professionals and homeowners aiming to prevent costly water damage with minimal hassle.

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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