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Figure l.--Connector for 76-mm (3-in) ID corrugated polyethylene pipe. The D- ring is shown inside the first full corru- gation, / ~ __m____' ~> -'\' "," '... The corrugated polyethylene pipe is the sa~e as that normally used for agri- ,- cultural drainage, but without slots. ,-- Water-tight connectors had to be developed to use it as irrigation laterals. Figure 1 shows such a connector for 76 rom (3 in) ID3 pipe. The O-ring, shown inside the corrugated polyethylene pipe, was made rrOili 9.5 rom (3/8 in) cross-section stock by using an O-ring splicing kit.' O-rings ''''th this cross-section are satisfactory for use with most 76- and 102-rom ID pipe with circular corrugations manufactured in the United States. O-rings for 76 nun (3 in) -~----,.. ID corrugated pipe, had 73 nun (2 7/8 in) ID; those for 102 rom (4 in) ID had an ID of 98.5 rom (3 7/8 in). The connection was made by slipping the O-ring into the first full corrugation of the polyethylene pipe, and inserting a poly- vinylchloride (PVC) pipe coupling into it. Tapering the ends of the pipe coupler with a lathe, as shown, and lubricating the O-ring with soap help ease the coupler into position. Machining an O-ring groove 1.6 m~ (1/16 in) deep by 6.3 rom (1/4 in) wide kept the connection from slipping when pressure was applied to the pipe. The connection was completed by installing a 25-rom- (l-in-) wide hose clamp around the corrugation con- taining the O-ring. (Because a hose clamp of this width was not avail- able when the picture was taken, a fiberglass spacer is shown under the narrower hose clamp in Fig. 1.) The PVC-pipe couplers were standard fittings. For 102-nun (4-in) ID corrugated pipe, a schedule 40, 3-in PVC-pipe coupler (or tee) has a satisfactory outside diameter (100 mm or 3 15/16 in). For 76-nun (3-in) ID corrugated pipe, schedule 80, 2-in PVC-pipe connectors have the appropriate outside diameter (76 rom or 3 in). Once the PVC coupler is installed, other standard PVC-pipe rittings can be used to join corrugated pipes of different diameters, or to connect the system to a water sourCe. For the Tacna, Arizona site, the small hoses were connected to the corrugated lateral by the procedures shown in Fig. 2. With the tool shown, a small hole was cut into the valley or the corrugated pipe and 3This is the minimum inside diameter ror the corrugated pipe. 'The O-ring splicing kit (No. 112) was obtained from Loctite Corp., Newington, Connecticut 06011. The citation of particular products or companies is for the convenience of the reader and does not imply any endorsement, guarantee, or preferential treatment by the Department of Agriculture or its agents. -2- OU2862