OATEY P9791E Dearborn® 1-1/4 in. x 16 in. Double Connect Slip Joint Extension Tube

Yes. The Dearborn P9791E is a double connect tube, meaning it has 1-1/4 inch slip joint inlets on both ends, so it drops between two 1-1/4 inch tubular slip joint connections directly. It ships with 2 slip joint nuts and 2 washers, so no separate nut-and-washer kit is needed for either end.

The P9791E meets ASTM F 409 and is IAPMO listed, which is what a facility or government inspector typically wants to see on plastic tubular drain fittings. Those are the only listings stated for the part.

No. The P9791E is sized 1-1/4 inch slip joint on both ends, which is lavatory and bath tubular size. Kitchen sinks are normally 1-1/2 inch tubular, so a 1-1/4 tube there would need a reducing washer or adapter and is the wrong part to start from. Order the 1-1/2 inch version of the tube instead.

The P9791E is a 16 inch tube with slip joint at both ends, so the usable run is 16 inches minus whatever you take up in insertion depth at each joint. Because both ends are slip joint, you can cut the tube to length and still seal on the cut end, which is how most under-sink height mismatches get made up.

It is polypropylene plastic, not metal. Polypropylene resists the drain chemicals and condensation that corrode chrome-plated brass tubular, which is why property managers standardize on it for back-of-house and multi-family kitchen and lavatory drains. Where the trap is exposed to view on an ADA lavatory or a public restroom, a chrome or brass tubular tube is the usual choice instead.

No sealant. The joints seal mechanically on the blue TPE washers, and Oatey states it provides a secure seal with hand tightening. The TPE washer material is used because it does not dry out and crack the way older rubber or poly washers do, which matters on drains that sit dry for long stretches in vacant units.

The P9791E is supplied in white. Dearborn builds this tube in white or black polypropylene, so if the rest of the exposed tubular under the sink is black, match it with the black version rather than mixing.