do you have to drain down hot water tank to fit this valve which is replacing a blown one of the same please

It all depends on your system and why / where the valve is installed etc. On my system it was (almost) at the top of the central heating radiator circuit and was completely separate from the hot water storage tank. I just needed to turn off the water supply and electric then drain sufficient water from the radiator loop so the water level and pressure fell sufficiently to allow me to safely replace the valve. I then had to restore the water level and bleed the system etc. Your central heating system is probably very different from mine, so this may not apply in your case. Irrespective of where ithe valve is located in the circuit you will definitely need to at least partially drain your system as the valve is intended to operate under pressure. If in doubt, consult a plumber.

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Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750

Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750

Product ID: 58745756

Details

Brand
Flamco
Exterior finish
Brass
Inlet connection size
0.38 Inches
Inlet connection type
Brass
Item dimensions L x W x H
23 x 3 x 80
Material
Brass

💨automatic air bleed valve

🔥max 120°C operating temp

⚙️3/8 inch brass thread

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MOP$355

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Description

💡 Elevate your heating game with Flamco’s smart, sleek air vent solution!

EFFORTLESS AIR REMOVAL - Automatic float valve ensures continuous, maintenance-free air venting
DURABILITY YOU CAN TRUST - Factory-tested quality with dirt-protected seal seat for long-lasting operation
COMPACT PRECISION ENGINEERING - Sleek brass housing fits seamlessly in tight heating systems
EASY INSTALLATION LEAK FREE FIT - 3/8 inch male thread with shut-off valve for quick, secure setup
RELIABLE HIGH PRESSURE PERFORMANCE - Operates safely up to 10 bar peak pressure for robust system stability

The Flamco Flexvent 3/8" Floatvent with shut-off valve is a compact, brass automatic air vent designed for central heating systems. It features a 3/8 inch male thread, supports operating temperatures up to 120°C and pressures up to 10 bar, and includes a protective chamber to keep the seal seat dirt-free. Factory-tested for quality, it ensures reliable, maintenance-free air bleeding to optimize system efficiency and longevity.

Specifications

ASIN	B0042ZQGKM
Best Sellers Rank	120,450 in DIY & Tools ( See Top 100 in DIY & Tools ) 959 in Central Heating System Accessories
Brand	Flamco
Customer Reviews	4.5 4.5 out of 5 stars (1,226)
Exterior Finish	Brass
Inlet Connection Size	0.38 Inches
Inlet Connection Type	Brass
Item Dimensions	23 x 3 x 80 centimetres
Item Weight	0.01 Kilograms
Manufacturer	Flamco
Material	Brass
Maximum Pressure	10 Bars
Model Number	27750
Number of Pieces	1
Number of Ports	2
Outlet Connection Size	9.53 Millimeters
Outlet Connection Type	NPT
Part Number	27750
Size	R 3⁄8"
Specification Met	DIN
Thread Size	3/8 duim
Thread Type	M (Manufacturer
Unit Count	1.0 count
Valve Type	Float Valve

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