4-1/4" Hole Dozer Bi-Metal Hole Saw

Blue White Gasket .625 Hole

Anderson Metals 00560-04 Plastic Compression Sleeve, 1/4" (Pack of 25)

Stark Diaphragm for 8'' Priority Valve, 2-way (no hole)

3/4" x 1/4" Bushing Flush Reducer

External Retaining Ring 1-1/4