Does this filter come with the tank cap as well?

I am not sure what you are looking for but it screws into the humidifier and closes off that opening. The cap is within the filter. There is no other "tank cap" included, so it will not close off where you fill the tank.

It appears that the demineralization filters are out of stock for the air innovation humidifier model mh-901d. any guess on when/where availability?

You can order them directly from the Air Innovations website: https://www.air-innovations.com/humidifier-demineralization-filters-for-hard-water-set-of-2

My son tore the spring-loaded valve off the bottom of the filter if I buy these does it come with a spring-loaded valve

Yes, the new filters will be exactly like the one that came with the humidifier.

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💨 Elevate your air game—breathe smarter, live better!

SLEEK SILVER DESIGN - Modern silver finish complements any professional or home office setup.
DUAL PACK CONVENIENCE - Two individual filters ensure you never run out—seamless replacement guaranteed.
LONG LASTING FRESHNESS - Up to 90 days of optimal filter performance keeps your air crisp and clean.
UNIVERSAL COMPATIBILITY - Works effortlessly with most Air Innovations humidifier models for versatile use.
PRECISION HUMIDISTAT SUPPORT - Enhances your humidifier’s ability to maintain perfect moisture levels.

The Air Innovations HUMIDIF Demineralization Filters come as a 2-pack with a sleek silver design, each lasting up to 90 days. Engineered to reduce mineral buildup, these filters are compatible with most Air Innovations humidifiers and support humidistat functionality, ensuring cleaner, healthier air in your workspace or home.

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€ 50.41

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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Brand	Air Innovations
Model Number	FILTER-HUMIDIF
Color	Silver
Product Dimensions	6.35 x 6.35 x 10.16 cm; 181.44 g
Material	Silver
Special Features	Humidistat
Item Weight	181 g

Air InnovationsAir Innovations HUMIDIF Humidifier Demineralization Filters-Set of 2, Silver

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