SKU: 80889455671

MIFAB MR-500-NPB Pressure Drop Activated Trap Seal Primer Serving Up To 6 Drains With A Water Output of 1/2oz

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Description

MIFAB MR-500-NPB Pressure Drop Activated Trap Seal Primer Serving Up To 6 Drains With A Water Output of 1/2ozMIFAB MR 500 NPB Pressure Drop Activated Trap Seal Primer Serving Up To 6 Drains With A Water Output of 1 2oz Product Specification: MIFAB model MR 500 NPB pressure drop activated brass trap seal primer, with inlet opening of (13) male N. P. T. and outlet opening of female (13) N. P. T. Complete with four view holes and removable filter screen. Serves up to 6 floor drain traps and requires no adjustments and no air pre charge. Product Function: MIFABs

MIFAB MR-500-NPB Pressure Drop Activated Trap Seal Primer Serving Up To 6 Drains With A Water Output of 1/2oz

Product Specification:

MIFAB® model MR-500-NPB pressure drop activated brass trap seal primer, with inlet opening of ½” (13) male N.P.T. and outlet opening of female ½” (13) N.P.T. Complete with four view holes and removable filter screen. Serves up to 6 floor drain traps and requires no adjustments and no air pre-charge.

Product Function:

MIFAB’s M-500 Series of pressure activated trap seal primers (MR-500-NPB, M1-500-NPB and M2-500-NPB) can be connected to any cold water line, and will be automatically activated when a valve or faucet, that is on the line, is opened. A pressure drop of three p.s.i. will activate all of the trap seal primers. MIFAB’s M-500 Series of trap seal primers can be disassembled in the field. Their unique design permits filter replacement without affecting the performance of the primer. The “O” ring seals are tested for reliability at a temperature range of -40 degrees to 450 degrees F. The M-500 Series of trap seal primers do not require adjustment. The opening range for all of MIFAB’s M-500 Series of trap seal primers is 20 to 80 p.s.i. All three models are listed with I.A.P.M.O. and C.S.A. and are tested and certified to the A.S.S.E. Standard 1018 and are so marked. U.S. Patent # 6,152,164.

Technical Downloads:

ALT Product Code:

  • MR-500
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SKU: 80889455671

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4.1 ★★★★★
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Verified Purchase
Luna Lovegood
Cuba, US
★★★★★ 5
Lightweight & comfortable
Size: XX-Large, Color: A
Comfy & pretty colors
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
K
Verified Purchase
Katie
Draper, US
★★★★★ 5
Great toddler backpack!
Size: Small, Color: All Black
My daughter is in prek 3 and loves this backpack. Nice and small for her to carry. A full folder will fit with a little force, but if you’re looking for something to actually carry folders and books, maybe not the best.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 28, 2026
M
Verified Purchase
Mick
Belleville, US
★★★★★ 5
“Tiny Backpack, Big Personality!”
This little backpack is doing big kid things — and my toddler knows it. The second we strapped it on, he marched around like he was off to close a business deal with juice boxes in both hands. It’s the perfect size for tiny shoulders, and the chest buckle? GENIUS. No more slippy straps or bag-flinging tantrums. It stays put like a champ, even during epic playground sprints and spontaneous dance moves in the grocery store. The material is sturdy, the zippers glide like butter, and the reflective strip makes my toddler look like he’s ready for a baby night shift. The color combo is sleek — black and grey with just the right touch of “cool kid on campus” energy. Plenty of space for snacks, sippy cups, a favorite toy, and 14 mysterious pebbles he insisted on collecting “for science.” If your 2-4-year-old wants to carry their own stuff and look proud doing it — this is the backpack for them. Highly recommend (and yes, I already ordered another one for backup... because toddlers). 🎒
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Reviewed in the United States on June 26, 2025
P
Verified Purchase
priscilla
West Palm Beach, US
★★★★★ 5
Good! Recommend
Size: Small, Color: Pink Dino
My 2 year old loves this backpack. I love the snap in the front for additional support of the distribution of weight. It has a good size cup holders and the inside of the bag is very spacious.
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Reviewed in the United States on December 11, 2025
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Verified Purchase
vkb
San Leandro, US
★★★★★ 5
A good buy especially for young kids
Our community is providing school supplies this year for an elementary school that we adopted. Backpacks are in big demand but, as you know if you’ve been shopping, pretty pricey. This backpack was a Prime-day find so I bought a couple of them but, even back to the regular price, it’s a good deal especially for very young kids. In person the backpack is cute and stylish with the vibrant range of colors you see in the product pictures. I bought the large backpack which, as you can see in the photo, is more than tall enough for a standard manila folder. The stitching seems sound and the straps work as you would expect; it also has two side pockets. If I had to pick a weak spot, I’d say it’s the zipper, especially the one on the front pouch. It’s not a problem at the moment but it’s nylon, not metal, and so I don’t expect it to last forever. But if it gets through one school year, I consider that good. I think it’s a pretty good buy if you’re on a budget.
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Reviewed in the United States on July 14, 2025

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