will this tubing fit the 40 mil. airstone?

No It will not 40 Mil. Is way to big. That is 1.75 inches round. However 4 mil is a bit under 1/4 inch. A 1/4 inch is equal to about 6 mill I would say that This tube is 6 mil and it fits real tight over the 1/4 inch fitting of the air pump. So much so I had to Chew the end to loosen it, Then shove it on. It works.

I use aquarium tubing to siphon gas out of my snow blower into my lawn mower in the spring time. Then I make sure it is drained and left out in the sun to evaporate out, then I throw it away. My guess is that this tubing should work well for short minutes of durations like that and then make sure it has at least a week chance to dry out before disposing of it. I would never use tubing not rated for gas lines to fix a gas line on a lawn mower or anything like that.

if my air pump fails, will all the water back-flow and flood the room?

If your pump fails in a very unusual manner, such that both check valves fail, and if it continues to pump with the outlet check valve actually functioning backwards, then it is remotely possible that the water could backflow into the room. But... none of that happens in real life; it only happens in comic books. If your pump fails, it will just stop pumping but both check valves will remain intact so the air line will continue to hold some small amount of pressure until you notice that all your fish are dead and your tank is sans bubbles. In order to start a siphon, which might drain your tank, there would need to be a fair quantity of water in the tubing OUTSIDE your tank, the weight of which will draw suction. What's more, that fair quantity of external water needs to be BELOW the (top) surface of the water in your tank. So... for all intents and purposes... no. It's not going to happen.

will this tubing fit on 4mm(air stone) and 5mm(check valve) outer diameter connections?

It will not. It might fit on 3.5mm fittings, because that's the inside diameter of this tubing.

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Penn Plax Airline Tubing for Aquariums -Clear and Flexible Resists Kinking, 25 Feet Standard

Penn Plax Airline Tubing for Aquariums -Clear and Flexible Resists Kinking, 25 Feet Standard

Product ID: 84794078

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Details

Brand
Penn-Plax
Material
Plastic
Colour
Clear
Product Dimensions
8.3L x 3.8W
Item Weight
0.11 Kilograms
Maximum Pressure
55 Pound per

💪55 PSI max pressure resists bursting

📏25 feet length for versatile setups

🔄1mm wall thickness prevents kinks

Description

💨 Keep your aquarium breathing easy with Penn Plax’s kink-proof clarity!

KINK RESISTANT DESIGN - 1mm thick walls maintain smooth air delivery, eliminating frustrating blockages.
LIGHTWEIGHT DURABLE - At just 0.11 kg, it’s easy to install and built to last, perfect for busy managers who value efficiency.
CRYSTAL CLEAR AESTHETIC - Transparent tubing blends seamlessly with any tank, keeping your setup sleek and professional.
BUILT TO WITHSTAND PRESSURE - Handles up to 55 PSI, ensuring reliable airflow even in demanding setups.
ENDLESS AQUARIUM FLEXIBILITY - 25 feet of clear tubing lets you customize your aquatic environment without limits.

Penn Plax Airline Tubing offers 25 feet of clear, flexible plastic tubing designed for indoor aquarium air pumps. With a 6mm diameter and 1mm wall thickness, it resists kinking and supports up to 55 PSI pressure, ensuring consistent airflow. Lightweight and durable, it’s an essential accessory for maintaining a pristine aquatic environment.

Specifications

Brand	Penn-Plax
Material	Plastic
Colour	Clear
Product Dimensions	8.3L x 3.8W Centimeters
Item Weight	0.11 Kilograms
Maximum Pressure	55 Pound per Square Inch
Nominal Wall Thickness	1 millimeter
Outside Diameter	6 Millimetres
Item Length	25 Feet
UPC	030172350252
Manufacturer	Monster Pets
Specific Uses For Product	Indoor
Global Trade Identification Number	00030172350252
Department	Unisex-Adult
Item model number	ST25
ASIN	B0002563MW

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