Does this fit aqua crest h-300 filter cartridge ?

Yes it does, the Everpure EV9259-14 QL3 Single head is used with Everpure cartridges: BH, H-50, H-54, H-104, H-200, H-300, OCS, OW-200L, OW2-Plus, OW4-Plus, S-104, S-200, 2K Plus, 4K Plus, 4K, 2CB5, 2CB5-S, 2CB5-K, 4C, 4CB5, 4CB5-S, 4CB5K.

does the QL3 fit the everpure H-104 cartridge

Hi,Yes, the QL3 head will accept all the H series Everpure cartridges, including the H-104.

Can I use the system hooked to city water (garden hose)

You using it for an RV fresh water? It can be done just have to buy the fiitings to make it work for your application

Will the new head solve the problem of the cartridge leaks?

Yes. These heads are now manufactured by a different company. There must be a slight variation in the tolerances of the cartridge fitting size. After replacing the old head with the new head, there was no longer a leak between the head and the cartridge.

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Description

💧 Upgrade your water game with precision and ease!

CERTIFIED SAFETY - All wetted parts pass NSF extraction tests for pure, safe water
EASY INSTALLATION - Includes mounting bracket and screws for hassle-free setup
SEAMLESS COMPATIBILITY - Optimized for Everpure 7SO and ESO cartridges
EFFORTLESS FLOW CONTROL - Built-in shut-off valve for quick, mess-free filter changes
COMPACT DURABLE DESIGN - Corrosion-resistant materials ensure long-lasting performance

The Everpure EV9259-14 QL3 Single Filter Head features a built-in shut-off valve and 3/8 inch NPT threads, supporting flow rates up to 1 GPM. Designed for Everpure 7SO and ESO cartridges, it includes a mounting bracket and screws for easy installation. Made from corrosion-resistant materials and NSF-tested for safety, this filter head ensures reliable, clean water filtration with minimal downtime.

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