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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Camco Brass Marine/RV Water Pressure Regulator – Protects RV Kitchen Small Appliances, Plumbing & Hoses – Reduces RV Water Pressure to Safe & Consistent 40-50 PSI – Drinking Water Safe (40055)

Product ID: 954960

Details

Brand
Camco
Exterior Finish
Brass
Inlet Connection Size
0.75 Inches
Inlet Connection Type
Female Iron
Item dimensions L x W x H
1 x 1 x 1
Material
Brass

💧Safe drinking water certified

📏Regulates pressure to 40-50 PSI

🛠️Brass build for durability

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Description

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

EFFORTLESS INSTALLATION - Quick-connect 3/4" garden hose threads for hassle-free setup on the go.
CERTIFIED LEAD FREE SAFETY - Crafted from CSA-certified lead-free brass, ensuring water purity and compliance.
PATENTED QUALITY ASSURANCE - Backed by patented technology and rigorous testing for reliable, long-lasting performance.
PRECISION PRESSURE CONTROL - Automatically maintains a safe and consistent 40-50 PSI to prevent 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 premium, lead-free brass device designed to protect your RV or boat plumbing by reducing incoming city water pressure to a safe 40-50 PSI. Certified safe for drinking water and easy to install with standard garden hose threads, it prevents costly damage to hoses and appliances, ensuring consistent water flow and peace of mind on every trip.

Specifications

ASIN	B003BZD08U
Best Sellers Rank	#471 in Automotive ( See Top 100 in Automotive ) #5 in RV Freshwater Hoses & Fittings
Brand Name	Camco
Connector Type	Coupling
Customer Reviews	4.7 4.7 out of 5 stars (23,561)
Exterior Finish	Brass
Global Trade Identification Number	00014717400558
Included Components	(1) Camco Camper/RV Water Pressure Regulator
Inlet Connection Size	0.75 Inches
Inlet Connection Type	Female Iron Pipe
Item Dimensions	1 x 1 x 1 inches
Item Type Name	Water Pressure Regulator Brass E/F LLC
Item Weight	1.8 Ounces
Manufacturer	Camco
Manufacturer Part Number	40055
Manufacturer Warranty Description	Limited 1 year
Material Type	Brass
Maximum Pressure	50 Pound per Square Inch
Model Number	40055
Number of Ports	1
Outlet Connection Size	0.75 Inches
Outlet Connection Type	FIP
Size	No Size
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	NSF/ANSI 372, CSA
Thread Size	3/4 inches
Thread Type	3/4" Garden Hose Thread
UPC	014717400558
Unit Count	1.0 Count
Valve Type	Pressure Relief Valve

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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In stock

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TrustScore 4.5 | 7,300+ reviews

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