Thank you, David, and thank you to everyone for joining us for our review of our first quarter 2021 financial results. Q1 financial performance reflects our second quarter of sequential sales increase, as we move past the trough impact of COVID-19 in the third quarter of 2020. Since 2020 was such an unusual year due to the pandemic, we are primarily measuring our performance based on sequential monthly and quarterly growth. Monthly results are likely to experience normal variation and move in either a positive or negative direction based upon unforeseen events like the winter storm that hit in February. However, our overall expectation is that we will see growth versus the previous month throughout the year, which should result in a significant increase in earnings as compared to last year. Overall, DXP's first quarter results were good to see. Service Centers and Supply Chain Services led the way, growing sequentially, which we will review shortly. That said, Q1 reflects the following summary takeaways. Strong first quarter sales and margin performance from recent acquisitions, gross margin improvement sequentially and year-over-year and strong quarterly free cash flow generation. Total sales for the first quarter increased sequentially 5.6% to $245.6 million. We experienced a 15.6% and 0.5% sequential sales growth in Service Centers and Supply Chain Services, respectively. Acquisitions contributed $28.4 million in sales during the quarter. As David mentioned, we are excited to have APO/CEC, Total Equipment and Pumping Solutions as part of the DXP family. Average daily sales for the first quarter were $3.9 million per day versus $3.8 million per day in Q4. Adjusting for acquisitions, average daily sales were $3.4 million per day for the first quarter. That said, the average daily sales trends during the quarter ramped from $3.8 million per day in January to $4.2 million per day in March, including the normalization of project work. Regions within our Service Centers business segment which experienced sequential sales growth include California, Texas, Gulf Coast and the Southwest. Key end markets driving the sales performance, include general industrial, food and beverage, mining, municipal and specialty chemicals. Supply Chain Services performance reflects a one-time $937,000 revenue adjustment associated with one of our customers' contract pricing. Adjusting for this, sales would have grown 3.1% sequentially, which is in line with our commentary during Q3 and Q4. Unadjusted sales grew 0.5% sequentially. SCS expects activity to continue to improve, as more customers open facilities along with vaccinations accelerate. Customers are also beginning to inquire if employees are vaccinated, which we see as a positive indicator. In terms of Innovative Pumping Solutions, we are monitoring the backlog as we continue to experience declines. As we discussed in Q4, we do see the start of a slow demand recovery and improvements in industry indicators. But the rebound in CapEx dollars is mainly tied to international projects at this point. Domestically, we see CapEx budgets essentially flat to slightly down from 2020. Our Q1 average backlog was down 20.4% from the 2017 average backlog and down 35% from the 2015 average backlog, but it's up 10.9%, compared to the 2016 monthly average backlog. We are continuing to trend slightly above 2016 levels based upon where our backlog stands at the end of the first quarter. Again, as we always comment, we are monitoring the backlog monthly and looking for new bookings always. Turning to our gross margins. DXP's total gross margins were 29.2%, 152 basis point improvement over Q4. Gross margins improved 48% from Q4 to Q1 within innovative pumping solutions as we experienced a mix shift associated with more international projects, as well as working through several municipal water and wastewater jobs and continuing to deliver on our efforts to move past lower margin jobs and make cost improvements despite the decline in the business. Service centers also experienced a 50 basis point improvement sequentially from Q4 to Q1, while supply chain services experienced a decline in gross margins that is unique and more associated with the one-time revenue adjustment mentioned in my previous comments. In terms of operating income combined all three business segments improved 25 basis points in sequential business segment operating income margins versus Q4. Total DXP operating income adjusting for the Q4 impairment expense decreased 82 basis points versus Q4 to $6.2 million. Service centers operating income margins increased 92 basis points from Q4 resulting in $22.1 million in operating income. Excluding acquisitions operating income margins increased 63 basis points sequentially. Innovative pumping solutions operating income margins declined 332 basis points sequentially, which primarily reflects higher SG&A costs, as we continue to rightsize our cost structure to demand, as well as some fixed cost absorption. Supply chain services experienced a 251 basis points decline in operating income margins primarily associated with the aforementioned one-time revenue adjustment associated with contract pricing. Our SG&A for the first quarter increased $65.4 million from Q4 this was -- increased excuse me to $65.4 million from Q4. This was primarily driven by the payout of commissions and bonuses associated with 2020 normal seasonal payroll taxes and first of the year items. Additionally, this also reflects transaction costs and other legal items. Similar to our comments in Q4, we are mindful that the contraction associated with the coronavirus is passing, and with accelerated distribution of vaccines, we are positioning DXP to respond to increased customer needs as we believe those who are in a position to respond today and tomorrow will gain the most market share. Turning to EBITDA. Q1 adjusted EBITDA was $13.9 million. Adjusted EBITDA margins were 5.7%. As we move through the COVID rebound we should experience operating leverage as David mentioned as long as we drive organic growth and maintain gross margins. In terms of tax, our effective tax rate continues to have a lot of noise this quarter similar to what happened in Q4. In Q1, DXP booked a significant reserve associated with the Texas R&D tax credits based upon the increased risk of challenge by the state. Going forward, if DXP continues to rebound we expect a normalized effective tax rate between 23% to 25%. In terms of EPS, our net income for Q1 was $411,000. Our earnings per share for the first quarter was $0.02 per diluted share. Our recent acquisitions were accretive to gross margins operating income and ultimately to earnings. Turning to the balance sheet and cash flow. In terms of working capital, our working capital increased $2.4 million from Q4 to $161 million. As a percentage of sales, this amounted to 16.9%. This primarily reflects an increase in accounts receivable and inventory. In terms of cash, we had $127.5 million in cash on the balance sheet at March 31. This is an increase of $10 million compared to Q4. Regarding CapEx, CapEx in the first quarter was $680, 000, or an increase of $538,000 from Q4 run rate levels, reflecting our ability to control capital investment and the minimal maintenance needs of our business. Turning to free cash flow. We generated solid operating cash flow during the first quarter producing $10.6 million in cash from operating activities and $11.2 million in free cash flow. This includes a $1.3 million cash inflow from the sale of assets. Return on invested capital or ROIC for the first quarter was 17%. At March 31, our fixed charge coverage ratio was 3.7:1 and our secured leverage ratio was 2.8:1. Total debt outstanding at March 31 was $329.2 million, which reflects the refinancing of our Term loan B and our first quarter of amortization. The refinancing reset our covenants and provides additional flexibility as we move forward. As a reminder -- excuse me, the new Term Loan B matures in 2027. In terms of liquidity, we remain undrawn on our ABL and have over $258.6 million in liquidity consisting of cash and the undrawn ABL. In terms of acquisitions earlier this week subsequent to the quarter-end, we closed on our acquisition of Carter & Verplanck and we anticipate closing another acquisition by the end of Q2 or early in Q3. Carter & Verplanck provides us with a platform to continue to expand our water and wastewater capabilities. Headquartered in Tampa, they ended Q1 with $4.2 million in sales. Our acquisition strategy continues to create value for DXP as evidenced by the strong quarter we had from year-end acquisitions, and we look forward to CVI's contribution in Q2. Our pipeline remains strong and is expanding in different end markets. More importantly the talent at the companies joining DXP is very high and brings expertise and valuable experience to our growing company. With that, we'll now turn the call over for questions.