Plastic filtration unit bonded by an L-shaped plastic melt

In a fluid filtration unit comprising:

• (a) thermoplastic first (3) and second (4) housing parts matingly engagable with each other and provided with a fluid inlet (10) and with at least one fluid outlet;
• (b) said first housing part (3) having a peripheral shoulder (13) on its base;
• and
• (c) a filtration element (5) having a feed side with a peripheral surface and a periphery and secured within and to said housing parts and in fluid communication with said fluid inlet and said at least one fluid outlet;
• the improvement comprising bonding means for bonding said housing parts and said filtration element together, said bonding means comprising a single L-shaped plastic melt (14) having a first leg and a second leg between said housing parts and along the periphery of said filtration element wherein said first leg of said L-shaped plastic melt binds said first and second housing parts (3, 4) together and said second leg binds the peripheral surface of said feed side of said filtration element (5) fluid-tight only to said peripheral shoulder ( 3) of said first housing part (3).