We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Brass backflow quick-connect adapter with three fittings and spare O-rings

Midwest Instrument

Midwest Instrument 110704 Backflow Quick Connect Adapter 3/4in NPT x 1/4in Flare with O-Rings

SKU CH-Q3NG-T177Q

Connects 3/4-inch NPT threads to 1/4-inch flare fittings and includes three spare O-rings

  • TypeOther
  • Quick-connect design speeds installation
  • Three adapters and spare O-rings included
  • 3/4 inch NPT to 1/4 inch flare compatibility
  • Works with Grainger test kit items 33, 34, 35 and 6AJV6
  • New condition ensures reliable performance

Backflow Quick Connect Adapter

The Midwest Instrument 110704 is a backflow quick connect adapter designed for plumbing and irrigation systems. It provides a secure connection point for testing or monitoring devices. The kit includes three adapters and three spare O-rings for immediate installation.

Replaces Threaded Test Port Connections

This adapter replaces traditional threaded connections on backflow preventers with a quick connect fitting. The upgrade is worth it when technicians perform frequent testing and need faster, tool-free attachment. It fits Grainger items 34CU33, 34CU34, 34CU35, and 6AJV6 for direct compatibility.

Limited to 3/4 Inch NPT and 1/4 Inch Flare

The adapter uses a 3/4 inch NPT thread on one end and a 1/4 inch flare fitting on the other. It cannot connect to pipes or ports with different thread standards or diameters. The three included spare O-rings support maintenance but do not expand the fitting's size range.

Highlights

  • Quick-connect design speeds installation
  • Three adapters and spare O-rings included
  • 3/4 inch NPT to 1/4 inch flare compatibility
  • Works with Grainger test kit items 33, 34, 35 and 6AJV6
  • New condition ensures reliable performance

Specifications

BrandMIDWEST INSTRUMENT
TypeOther

Questions about this item

Will the 3/4in NPT threads fit my existing backflow preventer ports?

The adapter has 3/4in NPT threads on one end, designed to mate with standard backflow preventer ports of the same size.

What is the correct way to seat the O-rings when I thread the 1/4in flare side?

Lubricate the three spare O-rings, slide them into the flare grooves before tightening, and avoid cross-threading the 1/4in flare connection.

How often should I replace the three spare O-rings included with kit 110704?

Inspect the O-rings annually and replace them at the first sign of cracking, flattening, or leakage during system testing.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.