A little more info. for anyone facing a similar problem:
If you are replacing a bathroom or kitchen sink
and your existing drain tail pipe ( often called a tailpiece) is either brass tubing or rigid PVC, here is a trap that not only prevents sewer gas and vermin from working its way up through the drain line and sink -- the function of all traps--but is flexible enough so it can be twisted or stretched slightly if the drain components are out of line. However, because the trap has the flexibility of a rubber glove, when the sink is stopped up you can reach under and squeeze the trap so the clog will be pushed along. No plunger needed. And if you have a vacation home in the colder northern climate where freezing does occur, because of the flexibility there is no need to pour anti freeze in the drain for winter protection. When the trap water freezes and expands so will the trap. No damage either.
Molded from flexible PVC plastic, two stainless steel clamps help make a leak proof connection to the tail pipe and the horizontal waste arm that leads to the drain-waste-vent line. Since the tail pipe of most sinks is either 1 1/4 or 1 1/2 inch tubing, this trap is molded to fit a 1 1/4 inch tail pipe. But if your tail pipe is 1 1/2 inch--typical for kitchen sinks--merely snip off the end to accommodate the larger tail pipe.
Installation is real easy. First, place a pan under the old trap to collect any water than may spill while the trap is being removed (Figure 1).
Then unscrew the jam nuts ( often referred to as slip nuts) as illustrated in Figure 2. You can slide off the jam nut and washer from the tail pipe but the jam nut on the horizontal arm cannot be pulled off because the end that attaches to the trap is flared. Of course, you can remove the jam nut by removing the entire arm but an easier technique is to slide the jam nut up so it is close to the wall.
Discard the old trap and position the new flexible trap as illustrated in Figure 3 . Let the clamps hang, and when both ends of the trap are connected slide the clamps up as illustrated in Figure 4 and tighten. Called Qwik Trap and manufactured buy Fernco, the trap is available from most home centers and plumbing supply houses.