3/4" x 1" FxF 18" Flex Connection

This RectorSeal flexible connector handles a size change in a single part, joining a 3/4" port to a 1" port across an 18-inch corrugated body with female threads on both ends. It is a practical fix for the everyday situation where the appliance port and the house supply do not share the same diameter, sparing you the stack of bushings and adapters that transition would otherwise demand and the joints they add.

Reducing without the fittings

Instead of nesting reducer bushings and adapters to bridge two sizes, this connector makes the 3/4"-to-1" step directly in one piece. That cleans up hookups on softeners, filters, and water heaters where the equipment and supply diameters differ, a mismatch that comes up constantly when newer appliances meet older rough-in plumbing. Fewer fittings means fewer threaded joints, which translates into a faster install and fewer potential leak points to revisit down the road.

• 3/4" x 1" female-by-female threaded ends
• Built-in size transition between 3/4" and 1"
• 18" corrugated length for flexible routing
• Flexes to absorb misalignment and vibration
• Lightweight at about 0.40 lbs
• RectorSeal reliability for water-treatment installs

Pay attention to orientation when you plan the run: thread the 1" end onto the larger line or port and the 3/4" end onto the smaller side so the transition lands where you need it. Apply potable-rated thread sealant, support the body while tightening so the corrugations are not kinked, and finish with a pressure check, leaving a gentle curve rather than a hard bend. The corrugated body then bends to match real-world layouts, taking strain off the joints and helping them stay leak-free through the normal expansion, contraction, and vibration of a working system. By combining a size step with flexibility in one connector, it saves both parts and labor, making it a smart staple for technicians who routinely mix 3/4" and 1" plumbing on residential treatment systems and want their connections clean. The built-in step is especially handy when an appliance arrives with a different inlet size than the supply you are tying into, removing the guesswork of stocking the right reducer on the spot.