Camco 10421
1/2 in connectionsSame 1/2-inch connection and probe length as 10423; package code differs.
View Camco 10421 productCamco RV Water Heater T&P Valves: 1/2 vs 3/4 Inch
A temperature-and-pressure relief valve is a safety component on a water heater, designed to open if tank temperature or pressure reaches its specified limit. Several Camco replacement valves look almost identical, but the thread size and inlet configuration are not always the same. Use the part-number chart to narrow your choice before checking the original water heater specification.
Match the existing relief valve—not just the water heater brand
Camco lists the standard valves below with factory relief settings of 150 PSI and 210°F. The valves have a brass body, stainless-steel spring, test lever and epoxy-coated temperature probe. Their role is different from that of a supply-line pressure regulator or the drain plug on the bottom of a tank.
The key measurement: Models 10421 and 10423 have 1/2-inch inlet/outlet connections; 10471 and 10473 have 3/4-inch connections. All four are catalogued with a 4-inch probe. 10493 is a separate extended-shank 3/4-inch variant. Do not choose based only on the shared 150 PSI rating.
Camco relief valve comparison by MPN
| Part number | Connection size | Probe / construction | Camco catalogue format |
|---|---|---|---|
| 10421 | 1/2 in | 4 in | Box catalogue format |
| 10423 | 1/2 in | 4 in | Carded catalogue format |
| 10471 | 3/4 in | 4 in | Box catalogue format |
| 10473 | 3/4 in | 4 in | Carded catalogue format |
| 10493 | 3/4 in | Extended-shank design | Carded catalogue format |
Camco lists 10421 and 10471 as boxed catalogue versions and 10423 and 10473 as carded versions. These catalogue packaging distinctions do not change the need to verify your heater's exact thread size, probe clearance and relief specifications. Retail quantities depend on each product listing.
View water heater relief valve listings
These matching products are listed on UsedRVParts. Open the individual listing to check its photographs, price and current availability.
Camco 10423
1/2 in connectionsShares 1/2-inch inlet/outlet size with 10421; compare the actual listing for packaging.
View Camco 10423 product
Camco 10471
3/4 in connections3/4-inch connection size; not a size-for-size replacement for 10421 or 10423.
View Camco 10471 product
Camco 10473
3/4 in connectionsCamco's carded 3/4-inch model with 4-inch probe; verify your heater's specification.
View Camco 10473 product
Camco 10493
3/4 in connectionsThis is the 2-1/2-inch shank variant. Confirm shank reach and all other dimensions against the original valve.
View Camco 10493 productChecklist before replacing a T&P valve
- Read the water heater data label. Confirm the required temperature and pressure relief settings and locate its service documentation.
- Identify the valve's threaded connection. A 1/2-inch valve should not be assumed to fit a 3/4-inch opening or vice versa. Avoid improvised reducers or adapters in a safety-valve installation.
- Compare the sensing probe and shank. Verify the clearances inside the tank and the original inlet geometry. Extended-shank 10493 is not simply a repackaged 10471.
- Check the discharge arrangement. Follow the water heater and applicable plumbing-code requirements for safe discharge-pipe sizing, routing and termination.
- Use a qualified installer when appropriate. Water under pressure can discharge at scalding temperatures. Never cap, plug, alter or defeat a relief valve.
Common questions
Are Camco 10421 and 10423 the same connection size?
Yes. Camco's published catalogue specifies 1/2-inch inlet/outlet connections and a 4-inch probe for both. They are listed with different catalogue packaging. Confirm the actual retail item when ordering.
What is different about 10471 and 10473?
These both have 3/4-inch inlet/outlet connections and a 4-inch probe, with different boxed versus carded catalogue formats. Match the heater requirements and original part number before replacement.
Does Camco 10493 replace the standard 10471 valve?
Not automatically. The 10493 catalogue entry identifies a 3/4-inch valve with a 2-1/2-inch shank. That additional length is a meaningful configuration difference; confirm it is the design specified for your heater.
Is the T&P valve the same as the water heater's drain or anode?
No. A temperature-and-pressure relief valve is a safety device, while the drain fitting empties the tank and some water heaters also use an anode rod. These parts must be identified separately.
Product viewing and pickup at UsedRVParts are available by appointment in Kelowna. Check the specific product listing for availability.
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