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Plumbers Do It With Pressure Hoffman Differential T-Shirt

Qty:
Basic T-Shirt
-$6.20
+$14.60
White
Classic Printing: No Underbase
+$2.10
+$2.10
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+$2.10
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+$2.10
+$2.10
+$2.10
+$2.10
+$2.10
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+$2.10
Vivid Printing: White Underbase
+$10.40
+$10.40
+$10.40
+$10.40
+$10.40
+$10.40
+$10.40
+$10.40
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About T-Shirts

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Style: Men's Basic T-Shirt

Comfortable, casual and loose fitting, our heavyweight t-shirt will easily become a closet staple. Made from 100% cotton, it's unisex and wears well on anyone and everyone. We’ve double-needle stitched the bottom and sleeve hems for extra durability.

Size & Fit

  • Model is 185 cm and is wearing a medium
  • Standard fit
  • Garment is unisex sizing
  • Fits true to size

Fabric & Care

  • 100% cotton (Heathers are a cotton/poly blend)
  • Double-needle hemmed sleeves and bottom
  • Machine wash cold, tumble dry low
  • Imported

About This Design

Plumbers Do It With Pressure Hoffman Differential T-Shirt

Plumbers Do It With Pressure Hoffman Differential T-Shirt

Plumbers will enjoy this tee featuring the US Patent 1777333 by William K Simpson for The Hoffman Differential Loop along with the truism saying "Plumbers Do It With Pressure." The Hoffman Differential Loop, a device with no moving parts, keeps water in the boiler by making sure that under no circumstance could pressure in the boiler exceed 10 ounces higher than the return piping. It does this by bleeding pressure into the returns after 10 ounces was reached in the boiler. Thus, for example, if the boiler reached 11 ounces in it, then 1 ounce would be bled into the return pipes, since at no time could the return pipes be more than 10 ounces different than the boiler. What this means is that water would always be able to return to the boiler and steam would always flow since there was a differential pressure between the supply and return pipes. This device maintains an unvarying water line in the boiler independent of boiler pressure, which means that water in the boiler is never lowered to a point where the heat from the fire can exert a destructive influence on the boiler. Celebrate technology that is still applicable today in the home heating systems of old houses with this t-shirt featuring a 20th century invention!

Customer Reviews

4.7 out of 5 stars rating32.1K Total Reviews
25173 total 5-star reviews4956 total 4-star reviews1077 total 3-star reviews485 total 2-star reviews439 total 1-star reviews
32,130 Reviews
Reviews for similar products
5 out of 5 stars rating
By o.25 April 2017Verified Purchase
Basic T-Shirt, White, Adult L
Zazzle Reviewer Program
The Shirt itself is a really nice, high quality material. Its quite thick and the colour is spot on whats in the pictures. The print is 100% what I wanted and the overall product is amazing. I ordered a 2XL which is already pretty big, it came a lot larger than I expected so next time i would order a smaller size, but thats down to me. It came just in time and the staff were super helpful in speeding up the shipping process for me so it would arrive on time. The printing turned out better than i could've imagined. I was very skeptical at first and wasnt sure how it was going to look, but it honestly looks awesome. So happy with it :)
5 out of 5 stars rating
By Marissa T.4 January 2024Verified Purchase
Basic T-Shirt, White, Adult S
Zazzle Reviewer Program
Super easy to order and look so good. Only came 5 days after ordering so super quickly and fits well. Bit baggy but i like my shirts bigger. Really clear looks good
5 out of 5 stars rating
By Anonymous15 December 2024Verified Purchase
Basic T-Shirt, Grey, Adult S
Brilliant in every respect. Great material t shirt, photo better than expected, fast delivery. Trustworthy seller. Thank you. ❤️.

Tags

T-Shirts
hoffman differential loopplumbersdo it with pressureplumbing technologyus patent 1777333older home steam heating systemplumbing inventor geek humourhoffman equalising loopboiler pressureinventor invention
All Products
hoffman differential loopplumbersdo it with pressureplumbing technologyus patent 1777333older home steam heating systemplumbing inventor geek humourhoffman equalising loopboiler pressureinventor invention

Other Info

Product ID: 235794499296147400
Added on 11/8/22, 1:59 am
Rating: G