B1796630 – PISTON FITTING

This 90-degree stub elbow connects the piston (fixed orifice metering device) to the refrigerant line in Goodman and Amana systems. If the fitting is damaged or leaking refrigerant at the piston connection, this is the replacement part.

Specs: 90-degree elbow, OEM stub fitting

Replaces: B1796630, BT1369063

Fits: Goodman and Amana condensers and heat pumps that use a piston metering device

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypePiston distributor fitting
• OEM CompatibilityUniversal

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• B1796630

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• Replacement piston fitting / distributor adapter — match thread size + style to your existing assembly
• Bring the old fitting in for side-by-side verification

What does .065 mean on a flowrater piston?

.065 inches is the orifice diameter. Smaller orifice = lower refrigerant flow = sized for smaller capacity or higher-pressure refrigerant. Match to your system's data plate spec.

Why does the same orifice fit different tonnages?

Because R-410A operates at higher pressures than R-22, a smaller orifice meters MORE refrigerant on R-410A than on R-22. So a .065 piston might serve a 2.5-ton R-410A system AND a 2.5-ton R-22 system — but you need to verify on your equipment's manual.

How do I install a flowrater piston?

1. Remove the old piston (often using a piston removal tool that grips the inner orifice). 2. Apply a NEW Teflon seal (don't reuse the old one). 3. Insert the new piston in the correct direction (arrow / flow indicator faces the evaporator distributor). 4. Torque the brass nut to manufacturer spec.

Can I use a piston instead of a TXV?

On some equipment, yes — but the system loses the ability to maintain proper superheat across changing conditions. Fixed-orifice pistons are simpler but less efficient. Check your equipment's installation manual for piston-vs-TXV compatibility.