Elbow 90 Degree - Slip x Slip (Schedule 80)Slip x Slip 90 Elbow. PVC Pipe Elbows for your plumbing needs. Use Schedule 80 90 Elbows where a turn is needed. More professional look than white Schedule 40 PVC. The golden rule of plumbing is that every job takes three trips to the store. While this can be frustrating locally it can be much worse when shopping online. Being short a fitting or two can delay a plumbing project for days. Here are some quick tips to avoid this. Plan your plumbing on