Best Air Gap Fittings for Dishwashers: Top Picks for Modern Kitchens
Choosing the right air gap fitting helps protect your dishwasher and plumbing from backflow while meeting local codes. This guide highlights five well-reviewed options from trusted brands, detailing construction, compatibility, and installation considerations. Each product section provides key features to help you compare at a glance and make an informed choice for your kitchen setup.
Product Quick Reference
| Product | Brand | Key Benefit |
|---|---|---|
| KRAUS Dishwasher Air Gap in Spot Free All-Brite™ Stainless Steel, KAG-1SFS | Kraus | Solid brass cover and ABS body with strong code compliance |
| Water Filter/Softener Air Gap ET115-002 | AIR GAP INTERNATIONAL | High flow capacity and flexible standpipe options |
| Drain Line Adapter ET116-001 | AIR GAP INTERNATIONAL | Easy hookup for RO and dishwasher to disposal line |
| Plumb Pak PP855-69 | Plumb Pak | Backflow protection with versatile standpipe compatibility |
| AG200-004 Dual Air Gap | AIR GAP INTERNATIONAL | Two hoses and extra-long thread for thick/thin countertops |
KRAUS Dishwasher Air Gap in Spot Free All-Brite™ Stainless Steel
The KAG-1SFS combines a durable ABS body with a solid brass cover for a high-end appearance and reliable performance. It features a 9-inch overall height, a 2.5-inch cap height, and a 1 7/8-inch cap diameter. The unit includes a pre-drilled 1 1/2-inch hole requirement and meets common code requirements that air gaps are necessary for dishwasher installations. A 1-year warranty supports continued user satisfaction with strong customer support. This model helps prevent wastewater backflow into clean dishes, preserving hygiene and appliance longevity.
Water Filter/Softener Air Gap ET115-002
The ET115-002 air gap is designed to connect the discharge from a water softener to the drain line. It offers a broad flow range—from 0.5 to 9 GPM—and a maximum capacity of 15 GPM overall. The 3/4-inch MIPT threaded inlet accepts standard 3/4-inch fittings, and it can connect to a 1-1/2 inch or 2 inch standpipe with appropriate adapters. Its installation can be pressure-fit or glued to a plastic standpipe, and it’s compatible with various standpipe configurations to fit different kitchen layouts.
Drain Line Adapter (DLA) ET116-001
The ET116-001 is a simple-to-install drain line adapter that connects both a dishwasher and an RO filter to a garbage disposal line. It accommodates multiple inside-diameter dishwasher hoses and includes a 1/4-inch RO quick-connect. A hose coupler and clamps are provided for a secure disposal inlet connection. The design emphasizes quiet operation with a self-cleaning port, helping to minimize noise and maintenance while bypassing the need to alter existing piping extensively.
Plumb Pak PP855-69 2 in. Plastic Water Softener Air Gap
This Plumb Pak model offers full backflow and anti-siphon protection, with compatibility for 1-1/2-inch and 2-inch standpipes. It can be mounted at multiple levels and supports shared connections for multiple air gaps on a single standpipe. The design supports typical usage rates of 1 to 7 GPM, making it suitable for both compact and larger dishwasher setups, while maintaining straightforward installation for homeowners aiming to upgrade their kitchen plumbing safety.
AG200-004 Dual Air Gap for Double Drawerdishwashers
The AG200-004 is designed for dual dishwashers, featuring two inlet ports and an outlet compatible with standard 7/8-inch hoses. It supports high flow with a maximum of 11 GPM overall, with per-port limits of 5.5 GPM. The two hoses connect to separate dishwashers, enabling simultaneous operation. The unit is compatible with various installation configurations and emphasizes straightforward routing of discharge water to the disposal line.
Buying Guide
Key considerations when choosing an air gap fitting:
- Standpipe compatibility: Confirm the standpipe diameter (1-1/2 inch or 2 inches) and whether adapters are included or required for your sink setup.
- Inlet and outlet sizes: Check the hose diameters (commonly 5/8 inch, 7/8 inch, or 1/2 inch) to ensure easy connections with your dishwasher and disposal system.
- Materials and durability: Look for solid brass caps and ABS or stainless components for corrosion resistance and long life, especially in moist kitchen environments.
- Code compliance: Many states require air gaps for dishwasher installations. Ensure the product adheres to local plumbing codes and includes a clear installation footprint (hole size, mounting height).
- Flow capacity: Consider the expected load from your dishwasher(s). Dual air gaps or higher-capacity units are better for larger households or dual-dishwasher setups.
- Noise and maintenance: Some models emphasize quiet operation and self-cleaning ports to minimize maintenance and noise during operation.
- Ease of installation: Some units are designed for quick connections to standard hoses or to common disposal lines, reducing the need for professional installation.
For broad compatibility, prioritize models with universal fittings, durable construction, and clear installation guidelines. If you have a dual-dishwasher configuration or a water-softener system, consider a dual air gap or a model that explicitly supports standpipe configurations and high flow rates. Always verify product listings for the correct inlet and outlet dimensions to ensure a seamless integration with your kitchen plumbing.