RectorSeal 87034 Pro-Fit 3/8" to 1/2" Quick Connect Reducing 90° Elbow, Push-to-Connect Refrigerant Fitting
The 87034 sits in the middle of the Pro-Fit reducing elbow range, bridging 3/8" to 1/2" through a fixed 90° turn. That pairing shows up constantly on multi-zone work, where a branch run in one diameter meets a trunk or an indoor unit in another and the connection point faces a wall. Rather than brazing a reducer to a nipple to an ell, the 87034 makes the whole transition as two push connections. Brass throughout, patented double O-ring and grip-ring sealing, 870 psig design pressure and a 250°F continuous operating rating.
Is a 3/8" to 1/2" Reducing Elbow the Right Fitting Here?
Both legs of this fitting seat to the same 1-1/4" depth, which makes it the most forgiving of the three reducing elbows to mark and assemble — one measurement covers both tubes. What is not forgiving is confusing the ends: 3/8" and 1/2" tubing look close enough in a dim attic that it pays to measure rather than eyeball, especially since the two legs are not interchangeable.
Plan about an inch and a half of clean, straight tube approaching each port. Neither leg has a nut and neither is torqued — the grip rings clamp as the tube goes in. The quality of the joint comes down to three things you control: a square cut, a thorough deburr inside and out, and a sealing surface with no scoring where the O-rings land.
Ideal for: Multi-zone branch runs meeting a larger trunk at a corner, indoor units whose port diameter and orientation both differ from the incoming line, condenser changeouts that alter the suction size, and tight equipment closets where a reducer and a separate elbow will not fit in line.
Working a larger pair of sizes? Step up to the RectorSeal 87035 Pro-Fit 1/2" to 5/8" Reducing 90° Elbow, or make the same size change in a straight run with the 87031 straight reducer.
Fitting selection is based on measured tube outside diameter and system operating conditions. Installation must be performed by an EPA 608-certified technician in accordance with RectorSeal's published instructions and applicable mechanical codes. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Fitting | 87034 — 3/8" to 1/2" Pro-Fit Quick Connect Reducing 90° Elbow (one fitting) |
|---|---|
| Connection Type | Push-to-Connect, Fixed 90° Elbow Reducer (3/8" x 1/2") |
| Body Material | Brass |
| Seal Design | Patented Double O-Ring and Grip Ring |
| Design Pressure | 870 psig (60 bar) |
| Continuous Operating Temperature | 250°F (121°C) |
| Insertion Depth | 1-1/4" on both legs |
| Assembly | Push-to-Connect — no tools, wrench, or torque required |
| Approved Tubing | Copper and Coated Aluminum Linesets |
| Certification | ICC-ES PMG-1616 (UL 207, UL 1963) |
Supplied as one factory-assembled reducing elbow, cased 10 per box. Both diameters are covered by the 87048 Pro-Fit Support Kit, and since both legs share the 1-1/4" depth, a single gauge mark works for each tube. The full Pro-Fit range is on the RectorSeal brand page.
Reducing Elbow & Sealing Features
87034 Transition Body
- Fixed 90° brass body stepping 3/8" to 1/2"
- Matched 1-1/4" seat depth on both legs
- Patented double O-ring seal at each port
- Grip ring sized independently to each diameter
- Machined internal transition between the bores
- 870 psig design pressure on both sides
- 250°F continuous operating temperature rating
- Resists galling from vibration and pressure pulsation
- Sight window on each leg for independent verification
- Covered by ICC-ES PMG-1616 to UL 207 and UL 1963
Multi-Zone & Retrofit Work
- Handles a size change and a direction change in one part
- Single shared insertion depth simplifies marking
- No nuts, no wrench, no torque on either connection
- No brazing rod, flux, filler, or nitrogen purge
- Suits branch-to-trunk transitions at a corner
- Resolves mismatched port size and orientation on changeouts
- Joins copper to copper or copper to coated aluminum
- Quick-release removal with the 87048 disconnect clip
- Approved for R-22, R-32, R-134a, R-290, R-410A, R-507, R-600a
- Packed 10 per manufacturer case
Specifications & Manuals
Product documentation includes the full Pro-Fit part number table, insertion depth specifications, approved tubing and refrigerant lists, and the ICC-ES PMG product rating certificate covering the certified pressure and temperature ratings.
Frequently Asked Questions
What sizes does the 87034 join?
3/8" O.D. on one leg and 1/2" O.D. on the other, connected through a fixed 90° turn. The legs are not interchangeable — measure both tubes before cutting.
Where does a 3/8" to 1/2" transition normally appear?
Most often on multi-zone systems, where a branch run in one diameter meets a trunk line or an indoor unit in another. It also turns up on changeouts where the replacement equipment specifies a different suction size than the original.
Do both legs of the 87034 seat to the same depth?
Yes — 1-1/4" on both sides. That makes this the simplest of the three reducing elbows to mark, since one gauge setting covers both tubes. The 87033 and 87035 each use two different depths.
Can the 87034 be installed with the larger end facing either direction?
The fitting is not directional in terms of flow, but each leg only accepts its own tube diameter — the 3/8" tube goes in the 3/8" port and the 1/2" tube in the 1/2" port. Orientation of the turn itself is whatever the routing requires.
What is the difference between the 87034 and the 87031?
Both step 3/8" to 1/2". The 87031 does it in a straight line; the 87034 does it through a 90° turn. Use the straight reducer where the run continues in the same direction.
Is a reducing elbow counted as one fitting or two for pressure drop?
It performs the function of two fittings, and pressure drop through a combined component is not simply the sum of a separate reducer and elbow. Where line sizing is tight, calculate equivalent length using the equipment manufacturer's guidance rather than estimating.
Click On Links Below For Documentation:
Technical Specifications
Brochure
Product Rating Certification
