TonGass RV Sewer Hose Fitting Adapter Combo Pack — 3" Bayonet to 3" PVC/ABS, Twist-On & Termination

TonGass Combo Pack supplies two black 3" adapters that bridge RV waste outlets to 3" PVC or ABS pipe and to standard sewer hose fittings.

This two-piece kit includes a rotating twist-on adapter and a termination adapter, each molded from durable ABS plastic and built to match OEM dimensions. Designed to create a secure link between an RV bayonet-style waste outlet and rigid plumbing or sewer hose, the set covers both rotating twist connections and glued slip-hub joints. Read on to see how the parts function, what to check when installing, and who benefits most from this compact connector kit.

How do these adapters connect an RV waste outlet to rigid pipe?

The rotating rigid pipe adapter uses a bayonet-style twist-on interface that lines up with the RV’s standard 3" outlet. Its 3" female slip hub accepts ABS or PVC pipe (use the correct adhesive) so you can glue the plumbing directly to the adapter for a fixed, leak-resistant run.

• 3" bayonet lug pattern fits most RV twist-on waste outlets
• Rotating feature eases alignment during installation
• 3" female slip hub for gluing ABS or PVC pipe
• OEM-dimension molding for a consistent seal

What role does the termination adapter play with a sewer hose?

The termination adapter provides a transition between a 3" twist-on connector and a glued pipe or a cap. One nubbed end accepts the RV bayonet-style twist-on, while the female slip hub receives 3" ABS pipe, letting you attach hose fittings, caps, or permanent plumbing.

• One end supports standard 3" twist-on connectors with bayonet nubs
• Other end is a 3" female slip hub for glued pipe connections
• Use with sewer hose fittings or for capping when parked
• Compatible with common RV sewer hardware arrangements

What materials and installation tips should I be aware of?

Both pieces are made from black ABS plastic. ABS and PVC require different adhesives, so match the solvent cement to the pipe material for a reliable bond. Check the hub surfaces for cleanliness and dry-fit parts before applying glue.

• Made from black ABS — use ABS-specific cement on ABS pipe
• For PVC pipe, use appropriate PVC primer and cement or use transition glue if required
• Dry-fit and rotate the twist-on to verify alignment before final assembly
• Inspect bayonet lugs and nubs for damage to ensure a tight seal

Will these adapters fit my RV and sewer setup?

The kit follows standard 3" bayonet/twist-on sizing and slip-hub dimensions used in most RV systems, making it suitable for many existing waste outlets and 3" rigid pipes. Always confirm your RV outlet uses the 3" bayonet pattern and check pipe diameters before purchasing.

• Intended for standard 3" RV twist-on outlets and 3" ABS/PVC pipe
• Verify bayonet lug count and spacing against your RV outlet
• Useful for both temporary hose connections and permanent glued runs
• OEM-spec molding increases likelihood of compatibility

Who is this for? RV owners, DIYers and service technicians who need a compact, OEM-sized transition between a 3" bayonet waste outlet and rigid 3" plumbing or sewer hose fittings will find this TonGass combo pack useful. It’s best for those installing or repairing RV waste lines who want a rotating twist-on option plus a glued slip-hub termination in a single kit. Avoid using the wrong solvent cement — match adhesives to ABS or PVC for a lasting seal.