75/50mm Metric Reducing Bushing
SKU: PVC-RDBSH-7550
- Compact Flush Reducer: Fits completely flush inside a standard 75mm female slip fitting to minimize vertical space and streamline complex manifolds.
- True Metric Calibration: Engineered with a 75mm outer spigot diameter and a 50mm inner slip socket port for a seamless, watertight solvent fit.
- Aquarium-Grade Dark Gray Finish: Neutral industrial aesthetic matches professional sumps, reef reactors, and high-end cabinetry manifolds.
- 100% Reef Safe Construction: Free from volatile heavy metal stabilizers and harmful plasticizers, making it safe for delicate marine corals and invertebrates.
- Heavy-Wall Structure: Molded from premium unplasticized PVC (uPVC) with integrated radial reinforcement ribs to handle high torque and vibration.
CoralVue 75/50mm Metric Reducing Bushing Fitting (SKU: PVC-RDBSH-7550)
The CoralVue 75/50mm Metric Reducing Bushing Fitting (SKU: PVC-RDBSH-7550) is a crucial space-saving fluid management component engineered to step down pipe sizing inside tight reef cabinet environments. When building advanced marine aquariums or multi-tank custom manifolds, transitioning from larger main drainage lines or master overflow drops down to standard secondary return runs is frequently required. Unlike bulky inline reducing couplings that add length to your pipe runs, this flush-style reducing bushing slides completely inside an existing 75mm metric female socket, changing its input diameter to 50mm without taking up extra physical space.
Molded to precise aquaculture tolerances, this dark gray bushing features a 75mm outer spigot end (which acts as a male pipe end) and a 50mm inner slip socket (female receiver). By solvent welding this fitting directly into a 75mm elbow, tee, union, or ball valve, you instantly convert that socket to accept a standard 50mm metric rigid pipe. Because of the significant step-down size difference, the interior of the fitting is structurally reinforced with radial structural ribs, keeping your plumbing layout clean, professional, and free of physical flex under pressure.
Key Features
Molded Internal Stop Ridge: The inner 50mm slip socket contains a built-in landing shoulder to ensure consistent insertion depth for a strong solvent weld.
Polished Flow Path: The smooth interior transitional wall limits localized fluid drag and prevents organic detritus from settling within the fitting.
uPVC Composition: Offers exceptional chemical and corrosion resistance against highly concentrated saltwater environments.
(Note: This retail SKU contains (1) individual standalone CoralVue 75mm to 50mm Reducing Bushing fitting. Solvent primers, cements, and rigid piping are sold under separate product categories).
What’s Included:
(1) CoralVue PVC-RDBSH-7550 75/50mm Metric Reducing Bushing Fitting
Technical Specs:
Official Manufacturing Title: 75mm Spigot x 50mm Female Slip Reducing Bushing
SKU / Factory Part Identifier: PVC-RDBSH-7550
Fitting Outer Connection (Spigot): Fits inside a standard 75mm Metric female socket
Fitting Inner Connection (Slip Socket): Accepts standard 50mm Metric rigid pipe
Primary Material Composition: Heavy-Wall Unplasticized Polyvinyl Chloride (uPVC)
Maximum System Pressure Rating: Up to 150 PSI continuous operational threshold
Maximum Thermal Operating Limit: 140°F (60°C) continuous service capacity
Primary Injection Color Finish: Dark Industrial Gray
- Ensure the 50mm rigid pipe is cut cleanly at a true 90-degree angle and deburred. Clean both the bushing's inner socket and outer spigot body.
- Apply a thin, even layer of PVC primer to the inside of the 75mm receiving fitting's socket and the outside of the bushing's 75mm spigot body.
- While wet, apply PVC solvent cement over both primed surfaces and insert the bushing fully into the 75mm fitting, rotating it 1/4 turn to spread the glue. Hold firmly for 15 seconds.
- Once the bushing is locked in place, prime the inside of the bushing's 50mm inner socket and the outside of the 50mm metric pipe.
- Apply PVC solvent cement to both 50mm primed surfaces, insert the 50mm pipe into the bushing until it bottoms out, and hold for 15 seconds.
- Allow a full 24-hour cure time before introducing high-pressure saltwater flow to guarantee the integrity of the chemical welds.
Pro Tips:
- Do Not Attempt to Glue Imperial Pipe Directly Into This Metric Fitting.
CRITICAL AQUARIUM PLUMBING DESIGN TIP: This reducing bushing is engineered to exact metric dimensions. The inner slip port accepts only standard 50mm metric rigid pipe. Do not attempt to force standard 1-1/2" domestic Schedule 40 or Schedule 80 pipe into the port. Doing so will result in a sloppy, mismatched connection that will fail under pressure.
- Use the Flush Design to Keep Your Cabinet Plumbing Organized. Because this bushing sits completely flush inside a standard 75mm female socket, it allows you to step down line sizes instantly right at your manifolds. By placing this bushing directly into a 75mm tee or union, you can transition straight down to 50mm for secondary drainage lines or high-volume return loops without adding extra length or weight to the plumbing line.
- Always Wipe Away Excess Glue Squeeze-Out. When welding the bushing inside your 75mm fitting, a small bead of solvent cement will slide forward. Be sure to wipe away any wet glue from the inner 50mm socket entry using a clean swab or cloth before inserting the 50mm pipe, ensuring a clean mating surface for the final joint.