Can these valve adapters be left on the bike without suffering air loss/leakage while riding or are they merely to be used for inflation times only?

I keep one on my bike. It is necessary to remove the adapter and tighten the presta valve top-nut; then replace the adapter. A minor inconvenience for the ability to air up just about anywhere.

Will this work with airpump at gas station?

If your tire is a standard shrader valve you wont need this for a gas station pump. If you have a presta tire you will need this for any pumps designed for shrader valves. Including gas station pumps

I am looking for something that will adapt a schrader pump head to go on a presta valve. Anyone comes across that?

thats what this is. works great

Will these fit into a small hand pump?

These thread onto the valve stem. Then you would use your pump as you normally do.

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Slime 20270 Presta to Schrader Valve Adapter - 2 Pack

Slime 20270 Presta to Schrader Valve Adapter - 2 Pack

Product ID: 329870254

Details

Brand
Slime
Colour
#08035
Fit type
Universal Fit
Material
Metal
Vehicle service type
Passenger Car

⚡Quick twist-on installation

🔧Converts Presta to Schrader valves

🛠️Durable brass construction with O-ring seal

Description

🚴‍♂️ Inflate with ease, ride with confidence!

SECURE O RING SEAL - Prevents air leaks with precision-engineered rubber sealing for maximum tire pressure retention.
PREMIUM BRASS BUILD - Rugged, corrosion-resistant brass ensures long-lasting reliability on every ride.
EFFORTLESS INSTALLATION - Simply loosen the Presta valve nut and twist on the adapter—no tools required.
ALWAYS READY ALWAYS RELIABLE - Two-pack convenience means you’re never caught without the right adapter, whether at home or on the go.
UNIVERSAL VALVE COMPATIBILITY - Seamlessly switch Presta valves to Schrader for effortless inflation anywhere.

The Slime 20270 Presta to Schrader Valve Adapter 2-pack converts Presta valves to standard Schrader valves, enabling compatibility with common pumps and gauges. Crafted from durable brass with rubber O-ring seals, these adapters ensure a secure, leak-free fit. Lightweight and easy to install, they’re a must-have for cyclists seeking hassle-free tire inflation anytime, anywhere.

Specifications

Asin	B007OX6E3S
Best Sellers Rank	#52,717 in Automotive (See Top 100 in Automotive) #91 in Automotive Tire Valve Tools
Brand Name	Slime
Color	#08035
Compatible With Vehicle Type	Passenger Car
Customer Reviews	4.6 4.6 out of 5 stars (1,987) 4.6 out of 5 stars
Fit Type	Universal Fit
Included Components	Unit^Instruction Guide
Item Type Name	Presta to Schrader Valve Adapter
Item Weight	0.02 Pounds
Manufacturer	Slime
Manufacturer Part Number	20270
Material Type	Metal
Model Number	20270
Number Of Items	2
Number Of Pieces	2
Shape	Round
Unit Count	1 Count
Upc	716281507380

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