need something to relieve at least 165,000 btu. where do I find this?

The heat generated is not as important as the pressure. I believe the max pressure of this valve is 150 PSI. I seem to recall that the working pressure in the Dometic water heater is around 125 PSI.

Is this the same valve as the Raritan WH3 or can it be substituted to it?

Camco 10471/10473 3/4" NPT connection Factory set at 150 PSI. I am not familiar with Raritan WH3, the product details read as follows. Committed to the environment and preserving sea life, Raritan designs products to help maintain an environmental balance and ensure the quality of marine waters. I cannot guarantee the Camco product follows these environmental guidelines. The Raritan product is rated at 75 PSI. I would not recommend substituting this item.

Is this the correct pressure temprature relief valve for the Atwood Product Number: 958680880, Model Number: GC 10A-4E?

No, the Camco Automatic Temperature and Pressure Relief Valve with Extension Probe and Lever is not the correct pressure temperature relief valve for the Atwood Product Number: 958680880, Model Number: GC 10A-4E.

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Description

🛠️ Safety meets sophistication — protect your water heater like a pro!

BUILT TO LAST - Robust all-brass construction paired with a stainless steel pressure spring for premium longevity.
CERTIFIED RELIABILITY - CSA certified to ANSI Z21.22 for trusted, industry-standard performance.
ULTIMATE SAFETY SHIELD - Protects your RV or home water heater from dangerous overpressure and overheating.
PRECISION ENGINEERED FIT - ¾-inch NPT connection with 1 3/16-inch shank for seamless installation.
CORROSION RESISTANT EXTENSION - Epoxy-coated 4-inch probe ensures long-lasting durability against buildup.

The Camco Automatic Temperature and Pressure Relief Valve (Model 10473) is a premium safety device designed to protect RV and home water heaters from excess pressure and temperature. Featuring a durable all-brass body, stainless steel spring, and an epoxy-coated extension probe, it is factory set to 150 PSI and 210°F. With a ¾-inch NPT connection and CSA certification to ANSI Z21.22, this valve ensures reliable, long-lasting protection and easy installation.

Specifications

Material	Brass, Stainless Steel, Epoxy
Brand	Camco
Item dimensions L x W x H	11.15 x 3.75 x 1.75 inches
Exterior Finish	Gold
Inlet Connection Type	National Pipe Tapered
Outlet Connection Type	MNPT
Maximum Operating Pressure	150 Pound per Square Inch
Number of Ports	1
Outlet Connection Size	0.75 Inches
Specification Met	Furnished with test lever
Global Trade Identification Number	00014717104739
Manufacturer	Camco
UPC	014717104739
Part Number	10473
Item Weight	9 ounces
Product Dimensions	11.15 x 3.75 x 1.75 inches
Item model number	10473
Is Discontinued By Manufacturer	No
Size	Оne Расk
Color	Silver/Pewter
Style	Brass body with stainless spring
Finish	Steel
Item Package Quantity	1
Mounting Type	Plate Mount
Included Components	(1) Camco Automatic Temperature and Pressure Relief Valve with Extension Probe and Lever
Batteries Included?	No
Batteries Required?	No
Warranty Description	Limited 1 Year

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