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.

ASIN	B002D4CVHG
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	333,558 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 477 in Water Filter Cartridges
Colour	Black
Customer Reviews	4.4 4.4 out of 5 stars (340)
Date First Available	7 May 2012
Item Package Quantity	1
Item Weight	435 g
Item model number	EV925914
Manufacturer	Everpure
Number of Pieces	1
Part Number	EV925914
Product Dimensions	10.16 x 9.53 x 9.53 cm; 435.45 g
Size	Single Unit

EV9259-14 QL3 Single Filter Head with Bracket, Shut-Off Valve, and 3/8 inch NPT Threads

Description

Specifications

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