The cross stands for salvation through the death and resurrection of Jesus Christ, the Son of God.
"...God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life."
John 3:16
The laver [large bowl for washing in] represents sanctification, that daily cleansing from sin by the power of the indwelling Holy Spirit.
"May God himself, the God of peace, sanctify you through and through. May your whole spirit, soul and body be kept blameless at the coming of our Lord Jesus Christ. The one who calls you is faithful and he will do it."
I Thessalonians 5:23, 24
The pitcher speaks of oil for divine life and physical healing that come through obedience to God's Word.
"Surely he took up our infirmities and carried our sorrows, yet we considered him stricken by God, smitten by him, and afflicted...and by his wounds, we are healed."
Isaiah 53:4, 5b
The crown symbolizes the return of our Lord Jesus Christ as King of kings and Lord of lords.
"This same Jesus, who has been taken from you into heaven, will come back in the same way you have seen him go into heaven."
Acts 1:11