Can this be used on a standard yard waterhose? Can the pressure be adjusted to a low and/or off level?

Yes, standard water hose. No, pressure cannot be adjusted. You can add a shutoff valve before the pressure valve if you want to adjust the volume flow.

What size are the fittings? 1/2" or 5/8" ?

Neither, they are the same size that will fit any outside faucet or garden hose. According the American National Standards Institute, garden hose thread--GHT--has an outside diameter of 1.0625 inches with 11.5 threads per inch.

after 5 years this has started to leak between inlet and outlet. is it repairable or just throw away

No, you don't need to throw it away unless it is badly corroded and the thread part is cracked or you are so rich and want to throw money away. Any female-gender garden hose-type connector has a o-ring gasket in it, and you need to replace it once every few years or when it leaks. Most hardware stores carry the replacement gaskets and they are pretty cheap, several pieces a dollar and it is very easy to replace it.

I live in an apartment and the pressure is often low when they're watering the lawns. What is minimum input pressure for 40 lb regulated output?

Regulating your water won't help. You'd have to take that up with management about the sprinklers. The issue may be that they're using 1" or larger pvc pipe for the sprinklers which means there's a pressure drop because there's not enough water flow to support it. they could contact the water company to adjust the pressure regulator for the main water line which should support the demand for the sprinklers.

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Description

🚐 Keep your water pressure in check and your adventures worry-free!

TESTED TRUSTED - Patented technology with CSA and NSF certifications for reliable, long-lasting performance.
HEALTH FIRST DESIGN - Crafted from lead-free brass, ensuring your water stays clean and safe to drink.
EFFORTLESS INSTALLATION - Quick-connects to standard 3/4" garden hoses for hassle-free setup on the go.
PRECISION PRESSURE CONTROL - Automatically regulates water pressure to a safe 40-50 PSI, preventing pipe bursts.
ULTIMATE PLUMBING PROTECTION - Safeguards your RV and marine plumbing from damaging high city water pressure.

The Camco Brass Marine/RV Water Pressure Regulator is a durable, lead-free brass device designed to protect your RV or boat plumbing by reducing incoming city water pressure to a safe and consistent 40-50 PSI. Certified to meet NSF/ANSI 372 and CSA standards, it ensures safe drinking water and prevents costly pipe damage. Easy to install with standard garden hose threads, this patented regulator is a must-have for any professional millennial adventurer seeking reliable water pressure control on the road or water.

Specifications

Material	Brass
Brand	Camco
Item dimensions L x W x H	4.88 x 3.94 x 1.38 inches
Exterior Finish	Brass
Inlet Connection Size	0.75 Inches
Inlet Connection Type	Female Iron Pipe
Outlet Connection Type	FNPT
Maximum Operating Pressure	5E+1 Pound per Square Inch
Number of Ports	1
Outlet Connection Size	0.75 Inches
Specification Met	NSF/ANSI 372, CSA
Global Trade Identification Number	00014717400558
Manufacturer	Camco
UPC	014717400558
Model	40055
Item Weight	1.8 ounces
Product Dimensions	4.88 x 3.94 x 1.38 inches
Item model number	40055
Batteries	1 Unknown batteries required.
Is Discontinued By Manufacturer	No
Manufacturer Part Number	40055
OEM Part Number	40055
Special Features	Lead Free
Voltage	12 Volts

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