What is the exact tap & die size for a USA garden hose thread (it's not NH)

I know the answer because I have the die sitting on my desk. It's from J.A. M TAYLOR TOOL CO. LIMITED,

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part # 40670, 3/4"-11 1/2 NH HSS Die 2" O/D @ $149.53 The definitive book is MACHINERY'S HANDBO OK. I have the 21st. Edition and on p. 1369 & 1370 it describes ANSI Standa rd Hose Coupling Screw Threads. Type NH is the full-form thread & type NHR is rolled. NHR is identical to NH, just a bit looser. Don't believe me. Fi nd your hose, get yourself a vernier caliper, a SAE thread gauge, & check f or yourself. Threads Per Inch will be between 11 and 12 (11.5) & External Thread Diameter will be between 1.0350 (NHR) and 1.0625 (NH). Steve.

Reply to
zebloc2
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Ridgid has a 1-1/2" x 11-1/2 TPI, at Grainger the cost (2017) is about $168.00 not including the tap handle. Yoy can get a handle for around $100 new. You could alternatively buy a lot of hoses for that.

Reply to
al_gone

replying to Brent, ROBERT WIECKOWICZ wrote: Garden hose connections are 12 tpi

Reply to
ROBERT WIECKOWICZ

replying to Brent, Erik wrote:

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Tapco taps. The reason no one can find GHT taps.. is because that's the thread name.. the TAP name is Nation Hose Thread 3/4 11 1/2 NH The link is for the Best.. too expensive, buy one from china. Remember that it's a meaty 3/4" hand tap so breaking it will be horrifying, buy a good one .. :)

Reply to
Erik

replying to Brent, Erik wrote:

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Tapco taps. The reason no one can find GHT taps.. is because that's the thread name.. the TAP name is National Hose Thread 3/4 11 1/2 NH The link is for the Best.. too expensive, buy one from china. Remember that it's a meaty

3/4" hand tap so breaking it will be horrifying, buy a good one .. :) (they sell dies too)
Reply to
Erik

I think it's the faucet threads that are the concern, not those of the hose. The anti backflow piece that's been required on outside faucets have a set screw that rusts/corrodes and cannot be removed and then the backflow piece with the setscrew galls the faucet's threads when coming off the faucet, which is necessary to repair or replace the useless backflow device, after time.

Reply to
Joe Dokes

I think it's the faucet threads that are the concern, not those of the hose. The anti backflow piece that's been required on outside faucets have a set screw that rusts/corrodes and cannot be removed and then the backflow piece with the setscrew galls the faucet's threads when coming off the faucet, which is necessary to repair or replace the useless backflow device, after time.

Reply to
Jim Wilkins

What is this backflow stuff? If you're water supply is never interrupted, why would anything flow backwards.

And if it flow backwards, is it going to be more than an inch or two?

It's 8 feet from my garden faucet to the main cold water pipe. How is the water ever going to flow back 8 feet.

And if it does, it will get diluted by the incoming clean water.

And then what are the odds I'll drink it, rather than flush the toilet, take a shower, or wash the dishes?

And if you do get a little garden hose poison, it will build up your resistance? Like with snake poison.

Who has not drunk out of the garden hose already?

Reply to
micky

On Fri, 05 Mar 2021 14:54:01 -0500, micky posted for all of us to digest...

It's called siphon. The overlords don't that water going back into the public water supply.

Reply to
Tekkie©

What is this backflow stuff? If you're water supply is never interrupted, why would anything flow backwards.

And if it flow backwards, is it going to be more than an inch or two?

It's 8 feet from my garden faucet to the main cold water pipe. How is the water ever going to flow back 8 feet.

And if it does, it will get diluted by the incoming clean water.

And then what are the odds I'll drink it, rather than flush the toilet, take a shower, or wash the dishes?

And if you do get a little garden hose poison, it will build up your resistance? Like with snake poison.

Who has not drunk out of the garden hose already?

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"Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened)."

Reply to
Jim Wilkins

But they all can be occasionally.

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Personally I've seen and rearranged a garden hose submerged in a swimming pool to refill it in the spring, to raise the level high enough to filter out the leaf debris, dead bugs, bird crap and green algae. The owner had covered the pool but a seam ripped.

Reply to
Jim Wilkins

At least on mine it was easier to use a fine saw to notch the backflow preventer on either side of the setscrew and then break out the screw. The body is brass and not very strong, the screws are relatively hard.

The saw cuts did no substantial harm to the faucet, the setscrew galling was minimal and easy to file out.

hth,

bob prohaska

Reply to
bob prohaska

The companies that make backflow preventers has some good lobbyists. At work we had to have them on all pressure vessels, like boilers. Our boilers had much higher pressure than the town water system.

At home we have to have them on the lawn sprinklers. I pay $25 a year for someone to come out and inspect it. Never saw the guy but there is a new tag on it and a bill in the mail.

I'd like to see good some statistics on how much good they do. This gives a number but does not say if it is one year or a hundred years.

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A report by the CDC confirmed that more than 1006 people across 19 states in the US had some form of sickness related to water contamination. Contaminated water can spread diseases in a split second due to the interconnection of water systems. Backflows tend to redirect contaminated water in homes.

Reply to
Ed Pawlowski

Didn't bother to go read it, but also does "sickness related to water contamination" only include fresh water systems? Public water systems? Or is it any water contamination, eg water in boats, RVs, drinking water from a stream, etc. Needing to inspect the backflow thing once a year is certainly excessive. Another govt program to rip you off and create more govt jobs. Even if they were going to inspect them, once every 5 years would be enough. Thankfully in NJ there is no inspection at all. There might be an inspection now when first installed, but 25 years ago when i had mine put in, they didn't even require that.

Reply to
trader_4

Salt, pepper, mustard.

Reply to
bruce bowser

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