What type of regulator i need for bullboss .22?

This is the correct regulator for a BullBoss.

I do not believe so, your best bet would be to call the guys over at pyramid Air or airgun Depot, or hatson USA, maybe they can inform you of a regulator that will fit and match the low pressure

Will this upgrade the pressure on a .25 Hatsan Blitz?

Not worth the waste of money go with Huma

will this work on airmax .25?

This does fit the Airmax .25. You'll have to adjust the trigger and tune it to get the most out of your rifle.

Hatsan At44 H Class Regulator One Size Black

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NZ$143

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Elevate your airgun game with pinpoint pressure control!

SEAMLESS UPGRADE - Drop-in design fits effortlessly into your (H) series PCP airgun
TRUSTED CRAFTSMANSHIP - Designed and manufactured by Hatsan, a leader in airgun tech
LIGHTWEIGHT DURABILITY - Crafted from premium aluminum for strength without bulk
PRECISION PRESSURE MASTERY - Adjustable output pressure for tailored performance
CONSISTENT POWER EVERY SHOT - Ensures stable shot velocities for unmatched accuracy

The Hatsan AT44 (H) Class Regulator is a precision-engineered aluminum regulator designed to optimize the output pressure of (H) series PCP airguns. Factory set at 125 BAR, it delivers consistent shot velocities and offers adjustable pressure settings for customized performance. Its easy drop-in upgrade design ensures quick installation, making it a must-have for serious airgun enthusiasts seeking reliability and accuracy.

Specifications

ASIN	B0744K6WTQ
Best Sellers Rank	#319,430 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #31 in Air Gun Tools
Brand Name	Hatsan
Color	Black
Customer Reviews	3.8 3.8 out of 5 stars (64)
Date First Available	July 20, 2017
Included Components	Regulator
Item Package Dimensions L x W x H	5.04 x 1.42 x 1.34 inches
Manufacturer	Hatsan
Material	Aluminum
Model Name	PCP Regulator (H) Class
Number of Items	1
Package Weight	0.12 Kilograms
Part Number	HA90435
Size	One Size
Sport Type	Hunting
Suggested Users	unisex-adult
Warranty Description	90-Day Limited

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